Add debug step to show Gemfile.lock diff

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

.github/workflows/ruby.yml

@@ -51,6 +51,9 @@ jobs:
       - run: yarn
       - run: bundle exec rake react:update
       - run: bundle exec rake ujs:update
+      - name: Show Gemfile.lock diff
+        if: always()
+        run: git diff Gemfile.lock || true
       - run: ./check_for_uncommitted_files.sh
 
   test: