Allow custom nginx configuration

[woodspire]

allow to use a custom nginx config file

building the docker container with:

-v /nginx.seafile.conf:/etc/nginx/sites-enabled/nginx.seafile.conf
-e SEAFILE_SERVER_NGINX_CONF_CUSTOM=1

[nekatak]

I agree with these changes. I have many issues caused from the nginx in the seafile container. For example running another reverse proxy before you cannot update anyhow client IPs and you cannot allow custom timeouts. This is a very useful change.

Of course an easy workaround for anyone interested to fix any issues is to simply mount a custom /etc/nginx/nginx.conf with the config and not include sites-enabled folder in it. Same thing as fix above more or less.