Cache bazel setup runs

Author: l46kok

.github/workflows/workflow.yml

@@ -11,7 +11,7 @@ on:
 # Cancel previous workflows on the PR when there are multiple fast commits.
 # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#concurrency
 concurrency:
-    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    group: ${{ github.workflow }}-${{ github.head_ref || GITHUB_REF }}
     cancel-in-progress: true
 
 jobs:
@@ -21,24 +21,32 @@ jobs:
     steps:
       - run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."
       - run: echo "🐧 Job is running on a ${{ runner.os }} server!"
-      - run: echo "🔎 The name of your branch is ${{ github.ref }} and your repository is ${{ github.repository }}."
+      - run: echo "🔎 The name of your branch is ${{ GITHUB_REF }} and your repository is ${{ github.repository }}."
       - name: Check out repository code
         uses: actions/checkout@v6
       - name: Setup Bazel
         uses: bazel-contrib/setup-bazel@0.18.0
+        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: Unwanted Dependencies
         run: .github/workflows/unwanted_deps.sh
       - name: Cross Artifact Duplicate Classes Check
         run: .github/workflows/cross_artifact_dependencies_check.sh
-      - run: echo "🍏 This job's status is ${{ job.status }}."
-
+      - run: echo "🍏 This job's status is ${{ JOB_STATUS }}."
+        env:
+          JOB_STATUS: ${{ job.status }}
   Bazel-Tests:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
       - run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."
       - run: echo "🐧 Job is running on a ${{ runner.os }} server!"
-      - run: echo "🔎 The name of your branch is ${{ github.ref }} and your repository is ${{ github.repository }}."
+      - run: echo "🔎 The name of your branch is ${{ GITHUB_REF }} and your repository is ${{ github.repository }}."
       - name: Check out repository code
         uses: actions/checkout@v6
       - name: Setup Bazel
@@ -58,8 +66,9 @@ jobs:
         # Exclude codelab exercises as they are intentionally made to fail
         # Exclude maven conformance tests. They are only executed when there's version change.
         run: bazelisk test ... --deleted_packages=//codelab/src/test/codelab --test_output=errors --test_tag_filters=-conformance_maven --build_tag_filters=-conformance_maven
-      - run: echo "🍏 This job's status is ${{ job.status }}."
-
+      - run: echo "🍏 This job's status is ${{ JOB_STATUS }}."
+        env:
+          JOB_STATUS: ${{ job.status }}
 
   # -- Start of Maven Conformance Tests (Ran only when there's version changes) --
   Maven-Conformance:
@@ -68,7 +77,7 @@ jobs:
     steps:
       - run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."
       - run: echo "🐧 Job is running on a ${{ runner.os }} server!"
-      - run: echo "🔎 The name of your branch is ${{ github.ref }} and your repository is ${{ github.repository }}."
+      - run: echo "🔎 The name of your branch is ${{ GITHUB_REF }} and your repository is ${{ github.repository }}."
       - name: Check out repository code
         uses: actions/checkout@v6
       - name: Get changed files
@@ -79,6 +88,13 @@ jobs:
       - name: Setup Bazel
         if: steps.changed_file.outputs.any_changed == 'true'
         uses: bazel-contrib/setup-bazel@0.18.0
+        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: Verify Version Consistency
         if: steps.changed_file.outputs.any_changed == 'true'
         run: |
@@ -103,4 +119,6 @@ jobs:
       - name: Run Conformance Maven Test on Version Change
         if: steps.changed_file.outputs.any_changed == 'true'
         run: bazelisk test //conformance/src/test/java/dev/cel/conformance:conformance_maven --test_output=errors
-      - run: echo "🍏 This job's status is ${{ job.status }}."
+      - run: echo "🍏 This job's status is ${{ JOB_STATUS }}."
+        env:
+          JOB_STATUS: ${{ job.status }}