Wrong github endpoing

Author: alex-kulakov

.github/workflows/delete-workflow-runs.yml

@@ -25,7 +25,7 @@ permissions:
 
 jobs:
   clear:
-    if: github.refs == 'refs/heads/master'
+    if: github.ref == 'refs/heads/master'
     runs-on: ubuntu-22.04
     timeout-minutes: 10