I host my own gitlab-ce instance in docker which works well. I mainly needed a web UI for git and I track issues with it. I think there are boards or at least free plugins for the community version, but I do not use them. You can version your documentation in .md files too. Not sure if it can substitute Jira for you, but you mentioned Bugzilla and I like gitlab a lot more.
Just make sure to update the container regularly, you can’t make big version jumps without the intermediate updates.
The community edition is open source, the Enterprise edition is not.