Notify the user who set auto-merge when a build fails
This is really annoying:
- I review an MR - LGTM!
🎉 - I edit the commit message and click 'Merge when build succeeds'
💚 - I go about my day.
- The build fails.
- I don't get notified, and the MR doesn't get merged.
Not-great solutions:
- Add a todo for the MR, so that I can easily see if it's been merged when going through my todos.
- Keep the tab open, so I get a notification when the build fails.
I think for now I'd just like to get a todo when that happens.
Related: https://gitlab.com/gitlab-org/gitlab-ce/issues/22236
/cc @ayufan