- name: Check for uncommitted changes
        run: |
          if ! git diff-index --quiet HEAD -- ; then
            echo "After running this workflow, the following files in git had uncommitted changes. (This workflow must not result in any checked-in files being changed!)"
            git diff-index --name-only HEAD --
            exit 1
          fi

          untracked_files=$(git ls-files --exclude-standard --others)
          if [ -n "$untracked_files" ]; then
            echo "Running this workflow created the following new untracked files which are not in .gitignore. (Running the workflow should not create any new files unless they are in .gitignore!)"
            echo "$untracked_files"
            exit 1
          fi