Split the check job of the CI action into separate jobs.

The test, integration test, and doc jobs can then run in parallel, which should speed up the CI process.

This also:
 * includes tests against the stable, nightly, and beta channels as well as the minimal supported Rust version 1.67.0,
 * removes the redundant build step, and
 * adds a clippy job.

PiperOrigin-RevId: 523967002

Author: hovinenb

.github/workflows/ci.yml

@@ -16,19 +16,77 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  build:
 
+  clippy:
     runs-on: ubuntu-latest
+    name: clippy / ${{ matrix.toolchain }}
+    permissions:
+      contents: read
+      checks: write
+    strategy:
+      fail-fast: false
+      matrix:
+        toolchain: [stable, beta]
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install ${{ matrix.toolchain }}
+        uses: dtolnay/rust-toolchain@b44cb146d03e8d870c57ab64b80f04586349ca5d
+        with:
+          toolchain: ${{ matrix.toolchain }}
+          components: clippy
+      - name: cargo clippy
+        uses: actions-rs/clippy-check@v1.0.7
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+  test:
+    runs-on: ubuntu-latest
+    name: test / ubuntu / ${{ matrix.toolchain }}
+    strategy:
+      matrix:
+        toolchain: [stable, 1.67.0, nightly, beta]
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install ${{ matrix.toolchain }}
+        uses: dtolnay/rust-toolchain@b44cb146d03e8d870c57ab64b80f04586349ca5d
+        with:
+          toolchain: ${{ matrix.toolchain }}
+      - name: cargo generate-lockfile
+        if: hashFiles('Cargo.lock') == ''
+        run: cargo generate-lockfile
+      - name: cargo test --locked
+        run: cargo test --locked --all-features
 
+  integration-test:
+    runs-on: ubuntu-latest
+    name: integration-test / ubuntu / ${{ matrix.toolchain }}
+    strategy:
+      matrix:
+        toolchain: [stable, 1.67.0, nightly, beta]
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install ${{ matrix.toolchain }}
+        uses: dtolnay/rust-toolchain@b44cb146d03e8d870c57ab64b80f04586349ca5d
+        with:
+          toolchain: ${{ matrix.toolchain }}
+      - name: cargo generate-lockfile
+        if: hashFiles('Cargo.lock') == ''
+        run: cargo generate-lockfile
+      - name: run_integration_tests.sh
+        run: /bin/bash ./run_integration_tests.sh
+
+  doc:
+    runs-on: ubuntu-latest
+    name: doc / nightly
     steps:
-    - uses: actions/checkout@v3
-    - name: Build
-      run: cargo build --verbose
-    - name: Run tests
-      run: cargo test --verbose
-    - name: Run integration tests
-      run: /bin/bash ./run_integration_tests.sh
-    - name: Check documentation
-      env:
-        RUSTDOCFLAGS: -D warnings
-      run: cargo doc
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Install nightly
+        uses: dtolnay/rust-toolchain@b44cb146d03e8d870c57ab64b80f04586349ca5d
+        with:
+          toolchain: nightly
+      - name: cargo doc
+        run: cargo doc --no-deps --all-features
+        env:
+          RUSTDOCFLAGS: -D warnings