Ensure that Nginx listens also additionally on the IPv6 socket if the
operating system inside the container provides IPv6 support. And as per
RFC 6540, IP nowadays means IPv4 and IPv6, not just IPv4-only.
- Add option to redirect www to non-www (REDIRECT_WWW).
- Add endpoint to check nginx workers.
- Custom virtual hosts (Server blocks) can be added by the user to create custom rules in `/opt/openvidu/custom-nginx-vhost`.
- Parametrize `worker_connections` in nginx.conf (WORKER_CONNECTIONS)
- Improve `discover_my_public_ip.sh` to use dns servers instead of http servers
- Posibility to autodiscover ipv6 if available by using `PUBLIC_IP=auto-ipv6` in nginx, `TURN_PUBLIC_IP=auto-ipv6` in coturn and `COTURN_IP=auto-ipv6` in openvidu-server.
By default ipv4 is used.