Optional IPv6 in nginx confs

roles/proxy/templates/server-nginx.conf.j2

@@ -1,13 +1,17 @@
 server {
   listen 80;
+{% if proxy.ipv6 is defined and proxy.ipv6 %}
   listen [::]:80;
+{% endif %}
   server_name {{ item.domain }};
   return 301 https://{{ item.domain }}$request_uri;
 }
 
 server {
   listen              443      ssl http2;
+{% if proxy.ipv6 is defined and proxy.ipv6 %}
   listen              [::]:443 ssl http2;
+{% endif %}
   server_name         {{ item.domain }};
   access_log          /var/log/nginx/{{ item.domain }}.log main;
 {% if proxy.production is defined and proxy.production and proxy.dns_cloudflare.wildcard_domains is defined and item.tls.cert is not defined %}