message: CI: Flush bazel caches
  ... after container image update, the cached paths don't
  fit anymore (seen in the clang compile).
diff: @@ -152,8 +152,8 @@ jobs:
  if: matrix.mode != 'clean' && matrix.mode != 'coverage'
  with:
  path: "/root/.cache/bazel"
  - key: bazelcache_${{ matrix.mode }}_${{ steps.cache_timestamp.outputs.time }}
  - restore-keys: bazelcache_${{ matrix.mode }}_
  + key: bazelcache2_${{ matrix.mode }}_${{ steps.cache_timestamp.outputs.time }}
  + restore-keys: bazelcache2_${{ matrix.mode }}_
  - name: Install Dependencies
  run: |
  