add a more detailed error message

Author: adrienpoly

.github/workflows/ci.yml

@@ -48,4 +48,10 @@ jobs:
       - name: Fail when generated changes are not checked-in
         run: |
           git update-index --refresh
-          git diff-index --quiet HEAD --
+          if ! git diff-index --quiet HEAD -- ; then
+            echo "The following files have changes that weren't committed:"
+            git diff --name-status
+            echo "\nDetailed diff for app/assets/javascripts/turbo files:"
+            git diff app/assets/javascripts/turbo*
+            exit 1
+          fi