Update pr_auto_merge.yml

Author: NadeemYaseen

.github/workflows/pr_auto_merge.yml

@@ -5,6 +5,9 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
     steps:
       - uses: actions/checkout@v4
       - name: Try auto merge