The devindex-updater.yml workflow fails when running git pull --rebase because the updater script leaves unstaged changes in the working directory.
To fix this, we will replace the git-auto-commit-action with a manual script that:

1. Configures the git user.
2. Stages and commits the changes first.
3. Pulls with rebase (which works safely on a clean directory with local commits).
4. Pushes the result.
   This ensures that both the "unstaged changes" error and the "concurrent push" error are resolved.