update lb action

.github/workflows/update_leaderboard_after_merge.yaml

@@ -0,0 +1,45 @@
+name: Update File After PR Closed
+
+on:
+  push:
+    branches:
+      - development
+jobs:
+  update-file:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Check if there are any changes in submissions dir
+        uses: dorny/[email protected]
+        id: changes
+        with:
+          # Use context to get the branch where commits were pushed.
+          # If there is only one long-lived branch (e.g. master),
+          # you can specify it directly.
+          # If it's not configured, the repository default branch is used.
+          base: ${{ github.ref }}        
+          filters: |
+            src:
+              - added|modified: 'session_2/challenge/submissions/**'
+          list-files: "shell"
+
+      - name: Print changed files
+        run: |
+          echo '${{ toJSON(steps.changes.outputs) }}'
+
+      - if: ${{ (steps.changes.outputs.src_count > 1) }}
+        uses: actions/github-script@v7
+        with:
+          script: core.setFailed('More than one submissions are not allowed at once.')          
+
+      # - name: Update file
+      #   if: github.event_name == 'pull_request' && github.event.action == 'closed' && github.event.pull_request.merged == true
+      #   run: |
+      #     git config --global user.name "GitHub Actions"
+      #     git config --global user.email "[email protected]"
+      #     echo "Updated content" > hello.txt
+      #     git add hello.txt
+      #     git commit -m "Update file after PR merge"
+      #     git push origin HEAD:${{ github.base_ref }}