[#651] Use GCS as a Bazel cache

.bazelrc

@@ -21,7 +21,6 @@ build:ci --test_env=ROOT_LOG_LEVEL=ERROR
 
 build:ci --noshow_progress
 build:ci --verbose_failures
-build:ci --disk_cache=~/.cache/bazel
-build:ci --repository_cache==~/.cache/bazel_external
+build:ci --remote_cache=https://storage.googleapis.com/airy-ci-cache
 
 test:ci --flaky_test_attempts=2

.github/workflows/main.yml

@@ -15,14 +15,6 @@ jobs:
           java-version: '11'
           architecture: 'x64'
 
-      - name: Mount bazel cache
-        uses: actions/cache@v2
-        with:
-          path: |
-            /home/runner/.cache/bazel
-            /home/runner/.cache/bazel_external
-          key: bazel
-
       - name: Install bazelisk
         run: |
           curl -LO "https://github.com/bazelbuild/bazelisk/releases/download/v1.1.0/bazelisk-linux-amd64"
@@ -32,9 +24,13 @@ jobs:
 
       - name: Enable CI settings
         run: |
+          echo "$GCS_SA_KEY" > key.json
           cat <<EOF >>.bazelrc
             common --config=ci
+            build:ci --google_credentials=key.json
           EOF
+        env:
+          GCS_SA_KEY: ${{secrets.GCS_SA_KEY}}
 
       - name: Lint
         run: |