add checkout customization for MediaWiki chart
A gerrit change number for the MW core can now be passed as a parameter. If nothing is passed, HEAD will be used as default
Bug: T356264
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.
A gerrit change number for the MW core can now be passed as a parameter. If nothing is passed, HEAD will be used as default
Bug: T356264