Update onpr_automerge.yaml

.github/workflows/onpr_automerge.yaml

@@ -4,15 +4,13 @@
 name: PR automerge
 on:
   pull_request:
-    types: [labeled]
-    branches:
-      - master
+    types: [ labeled ]
 
 jobs:
   enable-auto-merge:
     name: 🤖 Auto merge release PR
     runs-on: ubuntu-latest
-    if: contains(github.event.pull_request.labels.*.name, 'auto-merge')
+    if: ${{ github.event.label.name == 'auto-merge' }}
     steps:
       - name: Enable auto-merge
         uses: reitermarkus/automerge@v2.1.2