add auto-reviewer workflow with built-in GITHUB_TOKEN

Author: gursewak1997

.github/workflows/auto-review.yml

@@ -2,7 +2,7 @@ name: Auto Assign Reviewer
 
 on:
   pull_request_target:
-    types: [opened, ready_for_review, synchronize]
+    types: [opened, ready_for_review]
   workflow_dispatch: {}
 
 permissions:
@@ -27,18 +27,9 @@ jobs:
           python -m pip install --upgrade pip
           pip install pyyaml
           
-      - name: Authenticate with GitHub
-        run: |
-          if [ -z "${{ secrets.GH_PAT }}" ]; then
-            echo "Error: GH_PAT secret is not set"
-            exit 1
-          fi
-          # Use PAT directly without gh auth login
-          echo "Using PAT for authentication"
-          
       - name: Assign reviewer
         env:
           PR_NUMBER: ${{ github.event.pull_request.number }}
-          GH_TOKEN: ${{ secrets.GH_PAT }}
+          GH_TOKEN: ${{ github.token }}
         run: |
           python .github/scripts/assign_reviewer.py