[JCWasmx86]

Maybe something like gitweb? https://git-scm.com/docs/gitweb

I have not used it before, but it seems like it follows your requirements (Except auth using SSH keys maybe, but that could be a task for e.g. Nginx)

[melx]

Thanks, I discovered "git instaweb" which is based on gitweb. It's nice and offers mostly what I'm after,but the 100% layout width is terrible (no opt to configure it).