Implement Gitlab CI and Blubber config
Moving from Gerrit to GitLab means we have to re-create CI/automated testing. This depends on container environments as well, so let's utilize the WMF tooling of Blubber/kokkuri for this creation.
Bug: T347623
How to register an account on GitLab. To prevent spam, new accounts are locked until approved by an admin or the approver bot. You can also file an unlock request to expedite access.
Support: mw:GitLab, how to host a project on GitLab, #wikimedia-gitlab on libera.chat, #GitLab on Phabricator.
Moving from Gerrit to GitLab means we have to re-create CI/automated testing. This depends on container environments as well, so let's utilize the WMF tooling of Blubber/kokkuri for this creation.
Bug: T347623