Enable Bazel build and repository caching in GitHub Actions workflow.

PiperOrigin-RevId: 966874211

Author: jscat-oss-bot-external

.github/workflows/build_and_test.yml

@@ -15,9 +15,18 @@ jobs:
       - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by GitHub!"
       - run: echo "🔎 The name of your branch is ${GITHUB_REF} and your repository is ${{ github.repository }}."
       - name: Check out repository code
-        uses: actions/checkout@v4
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - run: echo "💡 The ${{ github.repository }} repository has been cloned to the runner."
       - run: echo "🖥️ The workflow is now ready to test your code on the runner."
+      - name: Setup Bazel
+        uses: bazel-contrib/setup-bazel@c5acdfb288317d0b5c0bbd7a396a3dc868bb0f86 # 0.19.0
+        with:
+          # Avoid downloading Bazel every time.
+          bazelisk-cache: true
+          # Store build cache per workflow.
+          disk-cache: ${{ github.workflow }}
+          # Share repository cache between workflows.
+          repository-cache: true
       - name: Test LLVM build
         run: |
           cd ${{ github.workspace }}