add workflow to cleanup action caches

.github/workflows/action-cache-cleanup.yml

@@ -0,0 +1,30 @@
+---
+name: cleanup GitHub actions caches by a branch
+on:
+ pull_request:
+ types:
+ - closed
+
+jobs:
+ cleanup:
+ runs-on: ubuntu-latest
+ steps:
+ - name: Cleanup
+ run: |
+ gh extension install actions/gh-actions-cache
+ echo "Fetching list of cache key"
+
+ cacheKeysForPR=$(gh actions-cache list -R "$REPO" -B "$BRANCH" -L 100 | cut -f 1 )
+
+ ## Setting this to not fail the workflow while deleting cache keys.
+ set +e
+ echo "Deleting caches..."
+ for cacheKey in $cacheKeysForPR
+ do
+ gh actions-cache delete "$cacheKey" -R "$REPO" -B "$BRANCH" --confirm
+ done
+ echo "Done"
+ env:
+ GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+ REPO: ${{ github.repository }}
+ BRANCH: refs/pull/${{ github.event.pull_request.number }}/merge