GitLab

* Add support for scratch+merge builds to rebuild for a different architecture
* Add support for importing successful builds from Koji (so it's not registered as not built in Distrobuild)
* Fix package link in Imports and Builds page.
* Add executor to Imports, Builds and Batch pages.
* Correctly expire the redis session
* Add distinct status for scratch builds
* Check that an import exists for a batch build requested package
* Add a new merge_scratch task to accommodate the first change
* Add a /merge_scratch endpoint for batch builds (single merges not supported right now)
* Auto refresh page instead of a success modal for package actions
* Add support for arch_override (Builds)
* Show all batches (including batches with one package only)

fix: A couple other routes need protecting

See merge request !1

* Move batches into another namespace (`/batches`)
* Add UI for listing and showing batches
* Add Redis backed sessions to not leak JWT
* Add Lookaside API
* Add Lookaside UI
* Ability to skip modules during batch builds
* Ability to cancel batch builds/imports
* Ability to retry failed builds/imports in batches
* Add logout link to UI
* Add imports list
* Add builds list
* Add commit info to imports in the UI
* Add commit, Koji and MBS info to builds in the UI
* Fix IN_PROGRESS status for imports