ci: use github actions cache to speedup bazel builds (#1444)

* ci: use github actions cache to speedup bazel builds
* ci: warm bazel repo cache daily

.github/actions/setup_bazel/action.yml

@@ -26,6 +26,19 @@ runs:
           exit 1
         fi
         echo "::endgroup::"
+
+    - name: Bazel repository cache (Linux)
+      uses: actions/cache/restore@69d9d449aced6a2ede0bc19182fadc3a0a42d2b0 # v3.2.6
+      if: runner.os == 'Linux' && (inputs.useCache == 'true' || inputs.useCache == 'readonly')
+      with:
+        path: |
+          ${{ github.workspace }}/tools/pseudo-version
+          /home/runner/.cache/bazel
+          /home/runner/.cache/shared_bazel_repository_cache
+          /home/runner/.cache/shared_bazel_action_cache
+          /tmp/bazel-zig-cc
+        key: bazel
+
     - name: Configure Bazel
       shell: bash
       if: inputs.useCache == 'true' || inputs.useCache == 'readonly'
@@ -43,6 +56,7 @@ runs:
         build --remote_header=x-buildbuddy-api-key=${BUILDBUDDY_ORG_API_KEY}
         EOF
         echo "::endgroup::"
+
     - name: Configure Bazel (readonly)
       shell: bash
       if: inputs.useCache == 'readonly'
@@ -50,6 +64,7 @@ runs:
         echo "::group::Configure Bazel (readonly)"
         echo "build --remote_upload_local_results=false" >> ~/.bazelrc
         echo "::endgroup::"
+
     - name: Check bazel version
       shell: bash
       run: bazel version

.github/workflows/warm-bazel-cache.yml

@@ -0,0 +1,53 @@
+name: Warm bazel cache
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "5 6 * * *" # At 06:05 every day.
+
+env:
+  CACHE_KEY: bazel
+
+permissions:
+  actions: write
+
+jobs:
+  warm-bazel-cache:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
+        with:
+          ref: ${{ !github.event.pull_request.head.repo.fork && github.head_ref || '' }}
+
+      - name: Build common targets
+        run: |
+          bazel build \
+            //bootstrapper/cmd/bootstrapper:bootstrapper_linux_amd64 \
+            //cli:cli_oss_linux_amd64 \
+            //cli:cli_oss_darwin_amd64 \
+            //debugd/cmd/cdbg:cdbg_linux_amd64 \
+            //debugd/cmd/cdbg:cdbg_darwin_amd64 \
+            //disk-mapper/cmd:disk-mapper_linux_amd64 \
+            //measurement-reader/cmd:measurement-reader_linux_amd64 \
+            //upgrade-agent/cmd:upgrade_agent_linux_amd64
+
+      - name: clear
+        continue-on-error: true
+        shell: bash
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          gh extension install actions/gh-actions-cache || true
+          gh actions-cache delete "${CACHE_KEY}" --confirm || true
+
+      - name: save
+        uses: actions/cache/save@88522ab9f39a2ea568f7027eddc7d8d8bc9d59c8 # v3.3.1
+        with:
+          path: |
+            ${{ github.workspace }}/tools/pseudo-version
+            /home/runner/.cache/bazel
+            /home/runner/.cache/shared_bazel_repository_cache
+            /home/runner/.cache/shared_bazel_action_cache
+            /tmp/bazel-zig-cc
+          key: ${{ env.CACHE_KEY }}