Using the bundled NGINX server to serve apps/sites on the same server.

Hey there! So as per my title, I'm looking to use the bundled nginx server to also host other sites on the same instance that my self-hosted GitLab is on. Currently, my only searches have brought me to this proposed solution: http://stackoverflow.com/questions/31762841/how-to-serve-other-vhosts-next-to-gitlab-omnibus-server-full-step-by-step-solu

My only concern with this is that it's quite lengthy and has a lot of moving parts along with it that may make my build go haywire. Is there a simpler solution for what I'm trying to achieve?

Basically, I have GitLab installed at dev.domain.com and I want to also host something like test.domain.com which utilizes a custom web hook to merge dev --> test on each build pass.

If there isn't a a simpler solution, my second proposed option would have to be setting up a different sever to hold the external destination (test.domain.com), is there a way to use git web hooks to push to an external server?