ci: Show the diff when the CI workflow isn't clean

Author: LukeMathWalker

.github/workflows/ci_freshness.yml

@@ -25,4 +25,4 @@ jobs:
       - name: Fail if anything changed
         run: |
           git add .
-          git diff --quiet --exit-code --cached || (echo "Please regenerate the docs.yml CI script" && exit 1)
+          git diff --exit-code --cached || (echo "Please regenerate the docs.yml CI script" && exit 1)