If you want even more minimal, Gerrit is structured as a Java app with no external dependencies like databases, and stores all it's configuration and runtime information on the filesystem, mostly as data structures in the git repos.
Shared filesystems is all you need to scale/replicate it, and it also makes the backup process quite simple.
The deployment may be simple, but at the same time, the Gerrit code review workflow is terrible.
I might be one of the few that is intrigued by this being that it’s Java but this looks really neat. Does it do git repositories like gitea, GitHub, etc, or is it more of a project management site for the repositories? They describe it as “code review”, so I wasn’t sure.
I’m a little put off on the google connection but it seems like it could run rather independently.