Fix error when PR author tries to add themselves as reviewer

HTTP 422 error occurred when PR author and repository owner were the same person
Added condition to only add reviewer when PR author is not the repository owner

Author: KubrickCode

.github/workflows/pr-automation.yml

@@ -12,6 +12,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Add owner as reviewer
+        if: github.event.pull_request.user.login != github.repository_owner
         run: |
           gh pr edit ${{ github.event.pull_request.number }} \
             --add-reviewer ${{ github.repository_owner }} \