feat: Add comprehensive GitHub Actions CI workflow for PR testing

.github/workflows/ci.yml

@@ -0,0 +1,173 @@
+name: CI
+
+on:
+  pull_request:
+    branches: ["*"]
+  push:
+    branches: ["main", "master"]
+
+env:
+  CARGO_TERM_COLOR: always
+  MIX_ENV: test
+
+jobs:
+  rust-checks:
+    name: Rust Checks
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        rust: [stable]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: ${{ matrix.rust }}
+          components: rustfmt, clippy
+
+      - name: Cache Rust dependencies
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            native/libsqlex/target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - name: Check Rust formatting
+        run: cargo fmt --check --manifest-path native/libsqlex/Cargo.toml
+
+      - name: Run Clippy
+        run: cargo clippy --manifest-path native/libsqlex/Cargo.toml --all-targets --all-features
+        # Note: Currently not treating warnings as errors due to await_holding_lock warnings
+        # These should be addressed in a future PR by using async-aware Mutex types
+
+      - name: Run Rust tests
+        run: cargo test --manifest-path native/libsqlex/Cargo.toml --all-features
+
+  elixir-tests:
+    name: Elixir ${{ matrix.elixir }} / OTP ${{ matrix.otp }} / ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        elixir: ['1.18.0', '1.17.0']
+        otp: ['27.0', '26.2']
+        exclude:
+          # OTP 27 requires Elixir 1.17+
+          - elixir: '1.16.0'
+            otp: '27.0'
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: stable
+
+      - name: Cache Rust dependencies
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            native/libsqlex/target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - name: Set up Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          elixir-version: ${{ matrix.elixir }}
+          otp-version: ${{ matrix.otp }}
+
+      - name: Cache Mix dependencies
+        uses: actions/cache@v4
+        with:
+          path: |
+            deps
+            _build
+          key: ${{ runner.os }}-mix-${{ matrix.elixir }}-${{ matrix.otp }}-${{ hashFiles('**/mix.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-mix-${{ matrix.elixir }}-${{ matrix.otp }}-
+
+      - name: Install Mix dependencies
+        run: mix deps.get
+
+      - name: Check Elixir formatting
+        run: mix format --check-formatted
+
+      - name: Compile (warnings as errors)
+        run: mix compile --warnings-as-errors
+
+      - name: Run Elixir tests
+        run: mix test
+
+  integration-test:
+    name: Integration Tests
+    runs-on: ubuntu-latest
+    needs: [rust-checks, elixir-tests]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Set up Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          elixir-version: '1.18.0'
+          otp-version: '27.0'
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: |
+            deps
+            _build
+            ~/.cargo
+            native/libsqlex/target/
+          key: ${{ runner.os }}-integration-${{ hashFiles('**/mix.lock', '**/Cargo.lock') }}
+
+      - name: Install dependencies
+        run: mix deps.get
+
+      - name: Compile project
+        run: mix compile
+
+      - name: Run full test suite
+        run: mix test --trace
+
+  all-checks-pass:
+    name: All Checks Pass
+    runs-on: ubuntu-latest
+    needs: [rust-checks, elixir-tests, integration-test]
+    if: always()
+
+    steps:
+      - name: Check if all jobs passed
+        run: |
+          if [ "${{ needs.rust-checks.result }}" != "success" ] || \
+             [ "${{ needs.elixir-tests.result }}" != "success" ] || \
+             [ "${{ needs.integration-test.result }}" != "success" ]; then
+            echo "One or more checks failed"
+            exit 1
+          fi
+          echo "All checks passed successfully!"