fix to check pr pm issue_comment triggered events

ref: https://dev.to/zirkelc/trigger-github-workflow-for-comment-on-pull-request-45l2

.github/workflows/test-action.yml

@@ -13,10 +13,17 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       pull-requests: write
+    if: github.event.issue.pull_request
     steps:
+      - name: Get PR branch
+        uses: xt0rted/pull-request-comment-branch@v1
+        id: comment-branch
+
       - name: Checkout
         id: checkout
         uses: actions/checkout@v4
+        with:
+          ref: ${{ steps.comment-branch.outputs.head_ref }}
 
       - name: Test Local Action
         id: test-action