Make Vladimir Shushlin BE maintainer for release-cli

Trainee maintainer issue: #12937 (closed)

Overview

3.5 years at Gitlab, maintainer of GitLab Pages

Examples of reviews

I didn't do many, but the project is simple enough, current maintainers agreed: #12937 (comment 1032435569)

Things to improve

Doing more reviews and my availability for them

Developer checklist

• Before this MR is merged
  • Mention @gitlab-org/maintainers/rails-backend, if not done (this issue template should do this automatically) (I'll mention release-cli maintainers)
  • Assign this issue to your manager
• After this MR is merged
  • Request a maintainer from the #backend_maintainers Slack channel to add you as an Owner to gitlab-org/maintainers/rails-backend
  • Consider adding 'backend maintainer' to your Slack notification keywords

Manager checklist

• Before this MR is merged
  • The MR has been open for 5 working days
  • If we have 10 or fewer backend maintainers, more than half of the existing maintainers approve the MR, otherwise if we have 11 or more maintainers, 5 existing maintainers approve the MR (see the maintainer list)
  • There are no blocking concerns raised (if there are, please follow https://about.gitlab.com/handbook/engineering/workflow/code-review/#how-to-become-a-project-maintainer)
• After this MR is merged
  • Announce the good news in the relevant channels listed in https://about.gitlab.com/handbook/engineering/#keeping-yourself-informed