I am always reluctant to use "clones" like gitbucket... If the usage is not the same, why making a clone? Indeed, it is always easier to copy a brand but is it worthwhile?
I love Gitlab and have a small installation (only 4 users). It's an wonderful github clone and it makes me happy when I use it.
However… it's a maintenance nightmare. I've never encountered a more obtuse and maintenance hostile app. I think maybe Rails apps just aren't meant to be distributed and run out in the wild. They are finicky and upgrading is a nightmare.
Compare that against, say, Wordpress, which is downright trivial to maintain. And it's darn near invisible if you're willing to sacrifice security for their in-browser updates.
alternatively, would love it if you could partner with one of the smaller git providers - like RepositoryHosting or XP-Dev.