add file changed debug for cicd

.github/workflows/update-brew-package.yml

@@ -51,6 +51,7 @@ jobs:
           sed -i "s/$old_sha/$sha/" ./Formula/smol-k8s-lab.rb
 
           export file_changed=`echo $(git diff --quiet --exit-code ./Formula/smol-k8s-lab.rb)`
+          echo "file_changed: $file_changed"
           if [[ $file_changed -ne 0 ]]; then
               echo -e "\n--------------------------------------------"
               echo -e "tagging and pushing to main branch\n"