Bundle poisoning between gitlab-ce test suite and gitaly-ruby
For whatever reason, gitaly-ruby is using the Gemfile from gitlab-ce in CI. This is very fragile and problematic. We lost a lot of time the past two days trying to upgrade the Gitaly version in gitlab-ce, because of this. We only worked around it by harmonizing part of the gem bundle between gitlab-ce and gitaly-ruby. This is not a sustainable approach.