ci(os-132): remove stale remote buildx mode

.github/actions/setup-buildx/action.yml

@@ -1,23 +1,11 @@
 name: Setup Docker Buildx
 description: >
-  Create a Docker Buildx builder. Two modes:
-    * driver=remote (default) — multi-arch builder against in-cluster BuildKit
-      pods. Requires EKS connectivity. Behaviour unchanged from prior versions.
-    * driver=local — single-node buildx on the local docker-container driver.
-      Pair with cache-to/cache-from=type=gha on build steps for persistence.
-      Works on nv-gha-runners; no EKS needed.
+  Create a Docker Buildx builder on the local docker-container driver. Pair
+  with cache-to/cache-from=type=gha on build steps for persistence. Works on
+  nv-gha-runners; no EKS BuildKit service is required.
   Cleanup is automatic when the job finishes (docker/setup-buildx-action default).
 
 inputs:
-  driver:
-    description: "buildx driver: 'remote' or 'local'"
-    default: remote
-  amd64-endpoint:
-    description: BuildKit endpoint for linux/amd64 (remote driver only)
-    default: tcp://buildkit-amd64.buildkit:1234
-  arm64-endpoint:
-    description: BuildKit endpoint for linux/arm64 (remote driver only)
-    default: tcp://buildkit-arm64.buildkit:1234
   name:
     description: Builder instance name
     default: openshell
@@ -34,21 +22,7 @@ inputs:
 runs:
   using: composite
   steps:
-    - name: Set up Docker Buildx (remote)
-      if: inputs.driver == 'remote'
-      uses: docker/setup-buildx-action@v3
-      with:
-        name: ${{ inputs.name }}
-        driver: remote
-        endpoint: ${{ inputs.amd64-endpoint }}
-        platforms: linux/amd64
-        append: |
-          - endpoint: ${{ inputs.arm64-endpoint }}
-            platforms: linux/arm64
-        buildkitd-config: ${{ inputs.buildkitd-config }}
-
     - name: Set up Docker Buildx (local)
-      if: inputs.driver == 'local'
       uses: docker/setup-buildx-action@v3
       with:
         name: ${{ inputs.name }}

.github/workflows/ci-image.yml

@@ -56,7 +56,6 @@ jobs:
       - name: Set up Docker Buildx
         uses: ./.github/actions/setup-buildx
         with:
-          driver: local
           buildkitd-config: ${{ steps.buildkit.outputs.config }}
 
       - name: Build and push CI image

.github/workflows/docker-build.yml

@@ -204,7 +204,6 @@ jobs:
       - name: Set up buildx (local driver)
         uses: ./.github/actions/setup-buildx
         with:
-          driver: local
           buildkitd-config: /etc/buildkit/buildkitd.toml
 
       - name: Download Rust binary artifact

.github/workflows/driver-vm-macos.yml

@@ -151,8 +151,6 @@ jobs:
 
       - name: Set up Docker Buildx
         uses: ./.github/actions/setup-buildx
-        with:
-          driver: local
 
       - name: Install zstd
         run: apt-get update && apt-get install -y --no-install-recommends zstd && rm -rf /var/lib/apt/lists/*

.github/workflows/release-dev.yml

@@ -179,8 +179,6 @@ jobs:
 
       - name: Set up Docker Buildx
         uses: ./.github/actions/setup-buildx
-        with:
-          driver: local
 
       - name: Mark workspace safe for git
         run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
@@ -349,8 +347,6 @@ jobs:
 
       - name: Set up Docker Buildx
         uses: ./.github/actions/setup-buildx
-        with:
-          driver: local
 
       - name: Build macOS binary via Docker
         run: |
@@ -498,8 +494,6 @@ jobs:
 
       - name: Set up Docker Buildx
         uses: ./.github/actions/setup-buildx
-        with:
-          driver: local
 
       - name: Build macOS binary via Docker
         run: |

.github/workflows/release-tag.yml

@@ -210,8 +210,6 @@ jobs:
 
       - name: Set up Docker Buildx
         uses: ./.github/actions/setup-buildx
-        with:
-          driver: local
 
       - name: Mark workspace safe for git
         run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
@@ -382,8 +380,6 @@ jobs:
 
       - name: Set up Docker Buildx
         uses: ./.github/actions/setup-buildx
-        with:
-          driver: local
 
       - name: Build macOS binary via Docker
         run: |
@@ -617,8 +613,6 @@ jobs:
 
       - name: Set up Docker Buildx
         uses: ./.github/actions/setup-buildx
-        with:
-          driver: local
 
       - name: Build macOS binary via Docker
         run: |