Update workflow to keep files

Author: petrzpav

.github/workflows/phpunit.yml

@@ -40,6 +40,7 @@ jobs:
         with:
           publish_dir: ./output
           publish_branch: badges
+          keep_files: true
           github_token: ${{ secrets.ACTIONS_TOKEN }}
           user_name: 'github-actions[bot]'
           user_email: 'github-actions[bot]@users.noreply.github.com'