chore: import upstream snapshot with attribution

.github/workflows/purge-cache.yml

@@ -0,0 +1,29 @@
+name: Purge Cache
+on:
+  workflow_dispatch: {}
+jobs:
+  purge-cache:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Delete Cache Entries
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          REPO: ${{ github.repository }}
+          BRANCH: ${{ github.ref_name }}
+        run: |
+          gh extension install actions/gh-actions-cache
+
+          echo "Fetching list of cache keys for branch '$BRANCH'"
+          cacheKeysForBranch=$(gh actions-cache list --limit 100 -R "$REPO" -B "$BRANCH" | cut -f 1 )
+
+          ## Setting this to not fail the workflow while deleting cache keys. 
+          set +e
+          echo "Deleting cache entries..."
+
+          for cacheKey in $cacheKeysForBranch
+          do
+              echo "Deleting entry: $cacheKey"
+              gh actions-cache delete "$cacheKey" -R "$REPO" -B "$BRANCH" --confirm
+          done
+
+          echo "Done"