Create ruby upgrade guide when moving to a new version
We should create an upgrade guide, so that the next time we change Ruby version we also add a rubocop job to target the previous still supported versions (if any).
This way developers don't start utilizing the new features of Ruby before we are ready: deprecations announced, documentation updated, all installation methods updated to the new library, etc.
- Bump Omnibus exclusion: omnibus-gitlab@500e90f0 (comment 164773045)
Edited by Stan Hu