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feat: Add multiplatform container image support (amd64, arm64, s390x)
Add comprehensive multiplatform Docker build support with: - New docker-multiplatform.yml workflow: - Parallel native builds for amd64 (ubuntu-latest) and arm64 (ubuntu-24.04-arm) - QEMU emulation for s390x on ubuntu-latest - Multiplatform manifest creation with buildx imagetools - Security scanning (Trivy, Grype, Syft SBOM) on amd64 - Cosign keyless signing for all architectures - Updated docker-release.yml: - Use buildx imagetools create for manifest handling - Preserves all architecture variants when tagging releases - Updated ibm-cloud-code-engine.yml: - Explicit --platform linux/amd64 flag for consistent builds - Updated Containerfile.lite for multiplatform compatibility: - Use ubi10-minimal as runtime base instead of scratch - Eliminates dnf --installroot which fails under QEMU emulation - Uses microdnf for runtime package installation - Maintains security scanning compatibility (RPM database preserved) - Enhanced Makefile targets: - container-build-multi: Build multiplatform image locally - container-inspect-manifest: Inspect multiplatform manifest in registry Closes #80 Signed-off-by: Mihai Criveti <[email protected]>
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‎.github/workflows/docker-multiplatform.yml‎

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# ===============================================================
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# Multiplatform Docker Build Workflow
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# ===============================================================
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#
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# This workflow builds container images for multiple architectures:
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# - linux/amd64 (native on ubuntu-latest)
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# - linux/arm64 (native on ubuntu-24.04-arm)
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# - linux/s390x (QEMU emulation on ubuntu-latest)
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#
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# Pipeline:
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# 1. Lint Dockerfile with Hadolint
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# 2. Build platform images in parallel
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# 3. Create multiplatform manifest
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# 4. Security scan (Trivy, Grype, SBOM)
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# 5. Sign with Cosign (keyless OIDC)
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#
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# ===============================================================
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name: Multiplatform Docker Build
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on:
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push:
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branches: ["main"]
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paths:
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- 'Containerfile.lite'
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- 'mcpgateway/**'
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- 'plugins/**'
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- 'pyproject.toml'
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- '.github/workflows/docker-multiplatform.yml'
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pull_request:
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branches: ["main"]
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paths:
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- 'Containerfile.lite'
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- 'mcpgateway/**'
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- 'plugins/**'
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- 'pyproject.toml'
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- '.github/workflows/docker-multiplatform.yml'
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schedule:
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- cron: "17 18 * * 2" # Weekly rebuild (Tuesday 18:17 UTC) for CVE patches
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workflow_dispatch:
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inputs:
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platforms:
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description: 'Platforms to build (comma-separated)'
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required: false
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default: 'linux/amd64,linux/arm64,linux/s390x'
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permissions:
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contents: read
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packages: write
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security-events: write
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actions: read
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id-token: write
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env:
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REGISTRY: ghcr.io
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IMAGE_NAME: ${{ github.repository }}
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jobs:
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# ---------------------------------------------------------------
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# Lint Dockerfile (architecture-independent, run once)
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# ---------------------------------------------------------------
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lint:
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name: Lint Dockerfile
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runs-on: ubuntu-latest
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steps:
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- name: Checkout code
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uses: actions/checkout@v5
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- name: Hadolint
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id: hadolint
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continue-on-error: true
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run: |
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curl -sSL https://github.com/hadolint/hadolint/releases/latest/download/hadolint-Linux-x86_64 -o /usr/local/bin/hadolint
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chmod +x /usr/local/bin/hadolint
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hadolint -f sarif Containerfile.lite > hadolint-results.sarif || true
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- name: Upload Hadolint SARIF
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if: always() && hashFiles('hadolint-results.sarif') != ''
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uses: github/codeql-action/upload-sarif@v3
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with:
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sarif_file: hadolint-results.sarif
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# ---------------------------------------------------------------
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# Build each platform in parallel
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# ---------------------------------------------------------------
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build:
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name: Build ${{ matrix.suffix }}
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needs: lint
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strategy:
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fail-fast: false
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matrix:
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include:
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- platform: linux/amd64
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runner: ubuntu-latest
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suffix: amd64
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- platform: linux/arm64
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runner: ubuntu-24.04-arm
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suffix: arm64
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- platform: linux/s390x
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runner: ubuntu-latest
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suffix: s390x
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qemu: true
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runs-on: ${{ matrix.runner }}
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steps:
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- name: Checkout code
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uses: actions/checkout@v5
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- name: Set image name lowercase
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run: |
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IMAGE_NAME_LC=$(echo "${{ env.IMAGE_NAME }}" | tr '[:upper:]' '[:lower:]')
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echo "IMAGE_NAME_LC=${IMAGE_NAME_LC}" >> $GITHUB_ENV
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- name: Set up QEMU
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if: matrix.qemu
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uses: docker/setup-qemu-action@v3
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with:
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platforms: ${{ matrix.platform }}
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- name: Set up Docker Buildx
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uses: docker/setup-buildx-action@v3
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- name: Log in to GHCR
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uses: docker/login-action@v3
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with:
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registry: ${{ env.REGISTRY }}
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username: ${{ github.actor }}
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password: ${{ secrets.GITHUB_TOKEN }}
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- name: Extract metadata
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id: meta
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uses: docker/metadata-action@v5
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with:
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images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_LC }}
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tags: |
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type=raw,value=${{ matrix.suffix }}-${{ github.sha }}
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- name: Build and push
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id: build
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uses: docker/build-push-action@v6
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with:
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context: .
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file: Containerfile.lite
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platforms: ${{ matrix.platform }}
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push: true
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tags: ${{ steps.meta.outputs.tags }}
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labels: ${{ steps.meta.outputs.labels }}
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cache-from: type=gha,scope=build-${{ matrix.suffix }}
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cache-to: type=gha,mode=max,scope=build-${{ matrix.suffix }}
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provenance: false
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- name: Export digest
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run: |
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mkdir -p /tmp/digests
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digest="${{ steps.build.outputs.digest }}"
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touch "/tmp/digests/${digest#sha256:}"
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echo "Digest for ${{ matrix.suffix }}: $digest"
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- name: Upload digest
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uses: actions/upload-artifact@v4
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with:
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name: digest-${{ matrix.suffix }}
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path: /tmp/digests/*
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if-no-files-found: error
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retention-days: 1
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# ---------------------------------------------------------------
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# Create multiplatform manifest
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# ---------------------------------------------------------------
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manifest:
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name: Create Manifest
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needs: build
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runs-on: ubuntu-latest
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steps:
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- name: Set image name lowercase
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run: |
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IMAGE_NAME_LC=$(echo "${{ env.IMAGE_NAME }}" | tr '[:upper:]' '[:lower:]')
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echo "IMAGE_NAME_LC=${IMAGE_NAME_LC}" >> $GITHUB_ENV
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- name: Set up Docker Buildx
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uses: docker/setup-buildx-action@v3
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- name: Log in to GHCR
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uses: docker/login-action@v3
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with:
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registry: ${{ env.REGISTRY }}
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username: ${{ github.actor }}
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password: ${{ secrets.GITHUB_TOKEN }}
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- name: Create and push manifest
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run: |
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SHA=${{ github.sha }}
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IMAGE=${{ env.REGISTRY }}/${{ env.IMAGE_NAME_LC }}
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echo "Creating multiplatform manifest..."
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docker buildx imagetools create \
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--tag "${IMAGE}:${SHA}" \
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--tag "${IMAGE}:latest" \
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"${IMAGE}:amd64-${SHA}" \
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"${IMAGE}:arm64-${SHA}" \
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"${IMAGE}:s390x-${SHA}"
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echo "Manifest created successfully"
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- name: Inspect manifest
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run: |
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IMAGE=${{ env.REGISTRY }}/${{ env.IMAGE_NAME_LC }}
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echo "Inspecting multiplatform manifest..."
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docker buildx imagetools inspect "${IMAGE}:latest"
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# ---------------------------------------------------------------
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# Security scanning (amd64 only - sufficient for CVE detection)
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# ---------------------------------------------------------------
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scan:
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name: Security Scan
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needs: manifest
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runs-on: ubuntu-latest
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if: github.ref == 'refs/heads/main'
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steps:
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- name: Checkout code
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uses: actions/checkout@v5
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- name: Set image name lowercase
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run: |
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IMAGE_NAME_LC=$(echo "${{ env.IMAGE_NAME }}" | tr '[:upper:]' '[:lower:]')
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echo "IMAGE_NAME_LC=${IMAGE_NAME_LC}" >> $GITHUB_ENV
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- name: Log in to GHCR
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uses: docker/login-action@v3
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with:
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registry: ${{ env.REGISTRY }}
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username: ${{ github.actor }}
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password: ${{ secrets.GITHUB_TOKEN }}
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- name: Pull amd64 image for scanning
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run: |
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docker pull --platform linux/amd64 ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_LC }}:latest
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- name: Generate SBOM (Syft)
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uses: anchore/sbom-action@v0
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with:
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image: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_LC }}:latest
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output-file: sbom.spdx.json
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- name: Upload SBOM
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uses: actions/upload-artifact@v4
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with:
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name: sbom
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path: sbom.spdx.json
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retention-days: 30
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- name: Trivy vulnerability scan
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uses: aquasecurity/trivy-action@master
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with:
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image-ref: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_LC }}:latest
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format: sarif
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output: trivy-results.sarif
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severity: CRITICAL,HIGH
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exit-code: 0
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- name: Upload Trivy SARIF
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if: always() && hashFiles('trivy-results.sarif') != ''
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uses: github/codeql-action/upload-sarif@v3
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with:
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sarif_file: trivy-results.sarif
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- name: Install Grype
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run: |
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curl -sSfL https://raw.githubusercontent.com/anchore/grype/main/install.sh | sh -s -- -b /usr/local/bin
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- name: Grype vulnerability scan
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continue-on-error: true
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run: |
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grype ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_LC }}:latest --scope all-layers --only-fixed
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- name: Grype SARIF report
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continue-on-error: true
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run: |
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grype ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_LC }}:latest --scope all-layers --output sarif --file grype-results.sarif
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- name: Upload Grype SARIF
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if: always() && hashFiles('grype-results.sarif') != ''
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uses: github/codeql-action/upload-sarif@v3
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with:
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sarif_file: grype-results.sarif
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# ---------------------------------------------------------------
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# Sign images with Cosign (keyless OIDC)
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# ---------------------------------------------------------------
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sign:
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name: Sign Images
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needs: [manifest, scan]
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runs-on: ubuntu-latest
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if: github.ref == 'refs/heads/main'
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steps:
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- name: Set image name lowercase
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run: |
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IMAGE_NAME_LC=$(echo "${{ env.IMAGE_NAME }}" | tr '[:upper:]' '[:lower:]')
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echo "IMAGE_NAME_LC=${IMAGE_NAME_LC}" >> $GITHUB_ENV
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- name: Install Cosign
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uses: sigstore/cosign-installer@v3
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- name: Log in to GHCR
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uses: docker/login-action@v3
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with:
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registry: ${{ env.REGISTRY }}
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username: ${{ github.actor }}
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password: ${{ secrets.GITHUB_TOKEN }}
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- name: Sign multiplatform image
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env:
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COSIGN_EXPERIMENTAL: "1"
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run: |
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IMAGE=${{ env.REGISTRY }}/${{ env.IMAGE_NAME_LC }}
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SHA=${{ github.sha }}
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echo "Signing ${IMAGE}:latest"
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cosign sign --yes "${IMAGE}:latest"
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echo "Signing ${IMAGE}:${SHA}"
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cosign sign --yes "${IMAGE}:${SHA}"
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echo "Images signed successfully"

‎.github/workflows/docker-release.yml‎

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password: ${{ secrets.GITHUB_TOKEN }}
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# ----------------------------------------------------------------
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# Step 4 Pull the image using the commit SHA tag
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# Step 4 Set up Docker Buildx for multiplatform manifest handling
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# ----------------------------------------------------------------
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- name: ⬇️ Pull image by commit SHA
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run: |
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IMAGE="ghcr.io/$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')"
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docker pull "$IMAGE:${{ steps.meta.outputs.sha }}"
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- name: 🛠️ Set up Docker Buildx
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uses: docker/setup-buildx-action@v3
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# ----------------------------------------------------------------
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# Step 5 Tag the image with the semantic version tag
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# Step 5 Create version tag from existing multiplatform manifest
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# Note: For multiplatform images, we use 'docker buildx imagetools create'
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# instead of 'docker pull' + 'docker tag' + 'docker push' because:
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# 1. Multiplatform images are manifest lists, not single images
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# 2. We create a new manifest that references the existing SHA-tagged image
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# 3. This preserves all architecture variants (amd64, arm64, s390x)
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# ----------------------------------------------------------------
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- name: 🏷️ Tag image with version
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- name: 🏷️ Create version tag for multiplatform manifest
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run: |
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IMAGE="ghcr.io/$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')"
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docker tag "$IMAGE:${{ steps.meta.outputs.sha }}" \
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"$IMAGE:${{ steps.meta.outputs.tag }}"
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echo "Creating version tag ${{ steps.meta.outputs.tag }} from ${IMAGE}:${{ steps.meta.outputs.sha }}"
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docker buildx imagetools create \
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"${IMAGE}:${{ steps.meta.outputs.sha }}" \
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--tag "${IMAGE}:${{ steps.meta.outputs.tag }}"
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# ----------------------------------------------------------------
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# Step 6 Push the new tag to GHCR
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# Step 6 Verify the new version tag
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# ----------------------------------------------------------------
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- name: 🚀 Push new version tag
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- name: 🔍 Verify version tag
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run: |
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IMAGE="ghcr.io/$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')"
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docker push "$IMAGE:${{ steps.meta.outputs.tag }}"
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echo "Inspecting ${IMAGE}:${{ steps.meta.outputs.tag }}"
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docker buildx imagetools inspect "${IMAGE}:${{ steps.meta.outputs.tag }}"

‎.github/workflows/ibm-cloud-code-engine.yml‎

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ibmcloud ce project select --name "$CODE_ENGINE_PROJECT"
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# -----------------------------------------------------------
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# 5️⃣ Build & tag image (cache-aware)
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# 5️⃣ Build & tag image (cache-aware, amd64 platform)
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# -----------------------------------------------------------
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- name: 🏗️ Build Docker image (with cache)
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run: |
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docker buildx build \
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--platform linux/amd64 \
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--file Containerfile.lite \
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--tag "$REGISTRY_HOSTNAME/$ICR_NAMESPACE/$IMAGE_NAME:$IMAGE_TAG" \
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--cache-from type=local,src=${{ env.CACHE_DIR }} \

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