use github app for workflow

Author: YukariChiba

.github/workflows/compare.yml

@@ -94,8 +94,14 @@ jobs:
           cat diff-$outarch/config.diff >> diff.output &&
           echo '```' >> diff.output);
           done
+      - uses: tibdex/github-app-token@v2.1.0
+        id: gettoken
+        with:
+          app_id: 337143
+          private_key: ${{ secrets.GH_APP_PRIVKEY }}
       - uses: peter-evans/create-or-update-comment@v4
         with:
+          token: ${{ steps.gettoken.outputs.token }}
           comment-id: ${{ steps.fc.outputs.comment-id }}
           issue-number: ${{ github.event.pull_request.number }}
           body-path: diff.output