How to register an account on GitLab. Due to spam, new accounts are locked until approved by an admin or the approver bot. Your GitLab account gets automatically approved within one hour if you are a member of Trusted Contributors in Gerrit, or a member of the Trusted-Contributors group in Phabricator and linked your Developer account to your Phabricator account. If none of these apply, you can 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.
(My previous post: Setting up Xdebug on Linux)
This makes it possible to use mwdev docker env set MEDIAWIKI_XDEBUG_CONFIG "client_host=host.docker.internal", which is more readable and stable(maybe?) than "client_host=172.17.0.1".
This is the solution for Linux (Fedora 36 workstation for me) and worked when I tested. But I didn't test for macOS and Windows.