ci: sync with template repository

Author: github-actions[bot]

.github/workflows/merge.yaml

@@ -1,6 +1,7 @@
 name: Merge
 
 on:
+  push:
   pull_request:
 
 concurrency:
@@ -19,6 +20,7 @@ jobs:
     permissions:
       contents: write
       pull-requests: write
+    if: github.event_name == 'pull_request'
     runs-on: ubuntu-latest
     steps:
       - name: Enable Auto-Merge (Squash)