fix cache key, add debug

.github/workflows/engine-build.yml

@@ -40,7 +40,7 @@ jobs:
  uses: actions/cache/restore@v4
  with:
  path: bazel-remote-data-overlay
- key: pr-bazel-remote-data
+ key: pr-bazel-remote-data-${{ matrix.system }}
  - name: Mount bazel remote overlay
  id: mount-overlay
  if: github.event_name == 'pull_request'
@@ -108,6 +108,7 @@ jobs:
 
  EOF
  - name: Save
+ if: github.event_name != 'pull_request'
  uses: namespace-actions/upload-artifact@v0
  with:
  name: output-${{ matrix.system }}
@@ -119,7 +120,9 @@ jobs:
  docker stop remote-cache
  - name: Unmount bazel remote overlay
  if: always() && steps.mount-overlay.outcome == 'success'
- run: sudo fusermount -u bazel-remote-data
+ run: |
+ sudo fusermount -u bazel-remote-data
+ ls bazel-remote-data-overlay
  - name: Save pull request's bazel remote cache overlay
  id: pr-cache-save
  if: always() && steps.pr-cache-restore.outcome == 'success'