how to configure multiple sites with ssl certificate?

[Bongo Cat MTV]

I just simply modify the conf file of Nginx by adding server tags and reload Nginx.
It works but when I add a new site I have to do the configuration work by hand again, since the fab deploy command will override the Nginx conf.

Is there a better way to set the servers information somewhere in setting files so that fabric can handle it by "fab deploy" command? It seems there is not much further information in mezzanine doc.