Update build-pr-cmk.yml

Author: shwstppr

.github/workflows/build-pr-cmk.yml

@@ -44,6 +44,7 @@ jobs:
 
       - name: Comment on PR with artifact link
         uses: peter-evans/create-or-update-comment@v4
+        if: ${{ github.event_name == 'pull_request' }}
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           issue-number: ${{ github.event.pull_request.number }}