ci: add S3 integration test job with MinIO and path filtering

Author: prantogg

.github/workflows/rust.yml

@@ -107,3 +107,63 @@ jobs:
         env:
           RUSTDOCFLAGS: "-D warnings"
         run: cargo doc --no-deps --workspace
+
+  # S3 integration tests using MinIO (only when S3-related files change)
+  test-s3-integration:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Check for S3-related changes
+        uses: dorny/paths-filter@v3
+        id: changes
+        with:
+          filters: |
+            s3:
+              - 'spatialbench-cli/src/s3_writer.rs'
+              - 'spatialbench-cli/src/runner.rs'
+              - 'spatialbench-cli/src/output_plan.rs'
+              - 'spatialbench-cli/src/main.rs'
+              - 'spatialbench-cli/tests/s3_integration.rs'
+              - '.github/workflows/rust.yml'
+
+      - name: Start MinIO
+        if: steps.changes.outputs.s3 == 'true'
+        run: |
+          docker run -d --name minio \
+            -p 9000:9000 \
+            -e MINIO_ROOT_USER=minioadmin \
+            -e MINIO_ROOT_PASSWORD=minioadmin \
+            bitnami/minio:latest
+          # Wait for MinIO to be ready
+          for i in $(seq 1 30); do
+            curl -sf http://localhost:9000/minio/health/live && break
+            sleep 1
+          done
+
+      - name: Create MinIO test bucket
+        if: steps.changes.outputs.s3 == 'true'
+        run: |
+          curl -sL https://dl.min.io/client/mc/release/linux-amd64/mc -o /usr/local/bin/mc
+          chmod +x /usr/local/bin/mc
+          mc alias set local http://localhost:9000 minioadmin minioadmin
+          mc mb local/spatialbench-test
+
+      - uses: dtolnay/rust-toolchain@stable
+        if: steps.changes.outputs.s3 == 'true'
+
+      - uses: Swatinem/rust-cache@v2
+        if: steps.changes.outputs.s3 == 'true'
+        with:
+          prefix-key: "rust-test-s3-v1"
+
+      - name: Run S3 integration tests
+        if: steps.changes.outputs.s3 == 'true'
+        env:
+          AWS_ACCESS_KEY_ID: minioadmin
+          AWS_SECRET_ACCESS_KEY: minioadmin
+          AWS_ENDPOINT: http://localhost:9000
+          AWS_REGION: us-east-1
+          AWS_ALLOW_HTTP: "true"
+          S3_TEST_BUCKET: spatialbench-test
+        run: cargo test -p spatialbench-cli --test s3_integration -- --ignored