- Update GitLab to 12.3.4
- Update update.py to cope with the new upstream repository structure
- Refactor gitlab-shell to use buildGoPackage and bundlerEnv for
dependencies
- Refactor gitlab-workhorse to use buildGoPackage for dependencies
- Make update.py able to update gitlab-shell and gitlab-workhorse
dependencies
- Various fixes necessary for update to work
This is a major version bump but things were generally straightforward
save two wrinkles:
* it is necessary to ignore collisions in the gitlab bundler
environment as both `omniauth_oauth2_generic` and
`apollo_upload_server` provide a `console` executable.
* grpc had to be patched since its build system expects the `AR`
environment variable to contain not just the path to `ar` but
also the `rpc` flags (see the discussion in nixpkgs #63056).
