Same instance under multiple domains, only serve relative URLs

Is it even possible to have GitLab work this way? And is it possible to setup this docker images this way?

For example:

Want to run it locally under http://192.168.1.x, but also have it globally under http://git.domain.com and accessible via VPN though http://10.8.x.x

I can only specify one GITLAB_HOST variable, and if its empty it defaults to localhost, most of the functionality works, but for example avatars for projects are served via 'http://{GITLAB_HOST}/uploads/project/avatar/P/P.png' instead of just '/uploads/project/avatar/P/P.png'

Any way to solve this issue?

Thanks

The issue names the GITLAB_HOST configuration and project avatar URLs but no files or tests. Start by tracing how the Docker image passes GITLAB_HOST into GitLab and how avatar URLs are generated; done means supporting the described multi-domain setup without hard-coded absolute URLs.