There are pretty good docs for installing the GitLab Development Kit:
https://gitlab.com/gitlab-org/gitlab-development-kit/-/blob/master/doc/index.md
It shouldn't be necessary to replicate these on-wiki, but a concise summary is probably a good idea. Additionally, I'm experimenting with just running it in a VM, given that it's a pretty massive set of dependencies to install on a multi-purpose client machine, so some notes around that would be good.