feat: enhance workflow to trigger on PR merge events

Co-authored-by: Stalin-143 <161853795+Stalin-143@users.noreply.github.com>

.github/workflows/contributors.yml

@@ -1,16 +1,25 @@
-name: Update Contributors
+name: Update Contributors Hall of Fame
 
 on:
+  # Trigger when PRs are merged to main (push to main branch)
   push:
     branches:
       - main
+  # Trigger when pull requests are closed (merged)
+  pull_request:
+    types: [closed]
+    branches:
+      - main
+  # Run daily at midnight UTC to catch any missed updates
   schedule:
-    # Run daily at midnight UTC
     - cron: '0 0 * * *'
+  # Allow manual trigger for on-demand updates
   workflow_dispatch:
 
 jobs:
   update-contributors:
+    # Only run if push to main, scheduled, manual trigger, or PR merged to main
+    if: github.event_name != 'pull_request' || github.event.pull_request.merged == true
     runs-on: ubuntu-latest
     permissions:
       contents: write
@@ -21,7 +30,7 @@ jobs:
         with:
           fetch-depth: 0
           
-      - name: Update Contributors
+      - name: Update Contributors Hall of Fame
         uses: akhilmhdh/contributors-readme-action@v2.3.6
         with:
           readme_path: "CONTRIBUTORS.md"