ci: run lint, tests and docker build on pull requests

.github/workflows/ci.yml

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+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  CARGO_TERM_COLOR: always
+  # Debug info only slows linking and bloats the cache in CI.
+  CARGO_PROFILE_DEV_DEBUG: 0
+
+jobs:
+  lint:
+    name: fmt and clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo fmt --all -- --check
+      - run: cargo clippy --all-targets --locked -- -D warnings
+
+  test:
+    name: tests
+    runs-on: ubuntu-latest
+    services:
+      # Matches docker-compose.yml; later releases need an auth token.
+      localstack:
+        image: localstack/localstack:4.14
+        ports:
+          - 4566:4566
+        env:
+          SERVICES: s3
+        options: >-
+          --health-cmd "curl -sf http://localhost:4566/_localstack/health"
+          --health-interval 2s
+          --health-timeout 2s
+          --health-retries 30
+    env:
+      AWS_ENDPOINT_URL: http://localhost:4566
+      AWS_ACCESS_KEY_ID: test
+      AWS_SECRET_ACCESS_KEY: test
+      AWS_REGION: us-east-1
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+      # The embedding models are large and change rarely.
+      - uses: actions/cache@v4
+        with:
+          path: .fastembed_cache
+          key: fastembed-${{ hashFiles('src/embed.rs') }}
+          restore-keys: fastembed-
+      - name: Unit tests
+        run: cargo test --locked
+      # s3vectors skips itself without TEST_VECTOR_BUCKET.
+      - name: Integration and e2e tests
+        run: cargo test --locked -- --ignored
+      - name: Upload e2e server logs
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: e2e-logs
+          path: target/e2e-logs/
+          if-no-files-found: ignore

.github/workflows/docker.yml

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+name: Docker
+
+# A release build plus the baked-in model takes many minutes, so PRs only
+# build the image when something that affects it changes.
+on:
+  pull_request:
+    paths:
+      - Dockerfile
+      - .dockerignore
+      - Cargo.toml
+      - Cargo.lock
+      - .github/workflows/docker.yml
+  push:
+    branches: [main]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  docker:
+    name: docker build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/setup-buildx-action@v3
+      - uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: false
+          cache-from: type=gha
+          cache-to: type=gha,mode=max