Create Gitlab MRs, show build status in their pipelines
- Automatically create "bump pkgrel" commits & branches for packages that need to be rebuilt
- Open MRs for all branches involved in a namespace if they don't exist yet
- Add link to buildbtw build namespace webview in MR description for now
- Should we try to prevent branches/MRs from getting involved in multiple build namespaces?
This is the investigative PoC issue. The equivalent production user story is here: #46