[jeffbr13]

Not an expert, but one solution is to have an Nginx configuration file for each website in `/etc/sites-enabled`, which matches requests based on the `server_name` parameter.

Then you can reverse-proxy requests to the right location/port from your Nginx webserver.

This could be provisioned pretty easily, but not from within a Dockerfile. I use a post-receive hook on a remote Git repository, for one of my own websites.