fix: exclude release-please PRs from auto-merge

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: nam-hle

.github/workflows/auto-merge.yml

@@ -10,8 +10,9 @@ permissions:
 jobs:
   auto-merge:
     if: >-
-      github.event.pull_request.author_association == 'OWNER' ||
-      github.event.pull_request.author_association == 'MEMBER'
+      !contains(github.event.pull_request.labels.*.name, 'autorelease: pending') &&
+      (github.event.pull_request.author_association == 'OWNER' ||
+      github.event.pull_request.author_association == 'MEMBER')
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps: