feat: establish Docker-based CI pipeline with consistent toolchain

- Add Rust 1.85 toolchain pinning via rust-toolchain.toml
- Create scripts/build.sh for unified build/test process in containers
- Mount rustfmt.toml to ensure consistent formatting between host/container
- Add rustfmt component installation to Dockerfile
- Mount tests/ directory for integration test access
- Standardize CI to run all operations inside containers

Eliminates toolchain version mismatches and provides single source of truth
for build/test process that works identically in development and CI.

Author: JohnBasrai

.github/workflows/ci.yml

@@ -21,42 +21,5 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v4
 
-    - name: Install Rust
-      uses: dtolnay/rust-toolchain@stable
-      with:
-        components: rustfmt
-
-    - name: Cache Cargo dependencies
-      uses: actions/cache@v4
-      with:
-        path: |
-          ~/.cargo/bin/
-          ~/.cargo/registry/index/
-          ~/.cargo/registry/cache/
-          ~/.cargo/git/db/
-          target/
-        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
-        restore-keys: |
-          ${{ runner.os }}-cargo-
-
-    - name: Check formatting
-      run: cargo fmt --check
-
-    - name: Build release
-      run: cargo build --release --quiet
-
-    - name: Run tests
-      run: cargo test --release --quiet --lib --bins
-
-    - name: Build and start lambda runtime
-      run: docker compose up -d --build
-
-    - name: Wait for lambda healthcheck
-      run: |
-        for i in {1..20}; do
-          timeout 2 nc -z localhost 9000 && break || sleep 3
-        done
-
-    - name: Run integration tests
-      run: docker exec aws-lambda-action-filter-lambda-1 \
-          cargo test --test integration_tests --release --quiet
+    - name: Run build and test script
+      run: ./scripts/build.sh

Dockerfile.lambda-runtime

@@ -12,6 +12,9 @@ RUN apt-get update && apt-get install -y \
 # Add cargo bin path explicitly
 ENV PATH="/usr/local/cargo/bin:${PATH}"
 
+# Install rustfmt component
+RUN rustup component add rustfmt
+
 # Install cargo-lambda
 RUN cargo install cargo-lambda --version 1.8.5 --locked --quiet
 

docker-compose.yml

@@ -9,9 +9,11 @@ services:
       - "9000:9000"
     volumes:
       - ./src:/app/src             # hot-reload watch point for lambda server
+      - ./tests:/app/tests         # Integration tests.
       - ./testdata:/app/testdata   # testdata for lambda invoke
       - ./Cargo.toml:/app/Cargo.toml
       - ./Cargo.lock:/app/Cargo.lock
+      - ./rustfmt.toml:/app/rustfmt.toml
       - ${CR8S_SCRATCH_DIR:-/var/tmp}/aws/dev-cargo:/usr/local/cargo/registry
       - ${CR8S_SCRATCH_DIR:-/var/tmp}/aws/dev-target:/app/target
     environment:

rust-toolchain.toml

@@ -0,0 +1,3 @@
+[toolchain]
+channel = "1.85"
+components = ["rustfmt", "clippy"]

scripts/build.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+set -euo pipefail
+
+# Build and start the container
+docker compose up -d --build
+
+# Wait for the service to be ready
+for i in {1..20}; do
+  timeout 2 nc -z localhost 9000 && break || sleep 3
+done
+
+# Run all tests inside the container
+docker exec aws-lambda-action-filter-lambda-1 cargo fmt --version
+docker exec aws-lambda-action-filter-lambda-1 cargo fmt --check
+docker exec aws-lambda-action-filter-lambda-1 cargo build --release --quiet
+docker exec aws-lambda-action-filter-lambda-1 cargo test --release --quiet
+
+echo "All tests passed!"