Add build run condition

Author: st-Wook

.github/workflows/comment-links-to-changed-games-in-pull-requests.yml

@@ -5,6 +5,8 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    # Check if the event is not triggered by a fork
+    if: !github.event.pull_request.head.repo.fork
 
     steps:
       - uses: actions/checkout@v3