Proxying via nginx on host machine

To proxy connections to the docker-zulip container from nginx running on a host machine, you'll want to follow the standard deployment recommendations for putting Zulip behind a proxy.

1. Add a /etc/nginx/sites-enabled/zulip.example.com.conf, based on the suggested nginx configuration. You should use a proxy_pass of http://127.0.0.1:8080.

2. Use these settings in your docker-compose.yml:

    ...
    zulip:
       ports:
         - "8080:80"
       environment:
         # Other settings...
         SETTING_EXTERNAL_HOST: "zulip.example.com"
         DISABLE_HTTPS: true
         LOADBALANCER_IPS: 172.16.0.0/20

   If your Docker network is something other than 172.16.0.0/20 (or a subset thereof), adjust LOADBALANCER_IPS accordingly.