Changed ruby version to 2.7.x to match upstream.
Added a gem config for gitlab-pg_query as it tries to download a source
tarball during the build process.
Also removed a patch for gitaly that has become obsolete by upstream fix
[here](de04077c25).
For some reason this untagged commit is the one referred to in the
main repository; this might be a mistake, but we'll have to package it
for now to follow upstream.
- 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).
