fix: Restrict PR comment action to main repository only

Add repository check to prevent permission errors when the workflow
runs on forked repositories. The comment action will now only execute
when triggered from the main vllm-project/aibrix repository.

This prevents "Resource not accessible by integration" errors for
fork-based pull requests while maintaining functionality for main
repository PRs.

Signed-off-by: ae86zhizhi <550149470@qq.com>

Author: ae86zhizhi

.github/workflows/complete-testing.yml

@@ -372,7 +372,7 @@ jobs:
         path: test-report.md
 
     - name: Comment PR with test results
-      if: github.event_name == 'pull_request'
+      if: github.event_name == 'pull_request' && github.repository == 'vllm-project/aibrix'
       uses: actions/github-script@v7
       with:
         script: |