[NEW] Avoids hardcoding IP address of LXD bridge network

roles/nginxproxy/templates/newsite.conf.j2

@@ -4,7 +4,7 @@ server {
     server_name {{ container }}.{{ dominio }};
     root /var/www/{{ container }};
     location / {
-        resolver 10.0.3.1 valid=1h;
+        resolver {{ ansible_default_ipv4.gateway }} valid=1h;
         set $container "http://{{ container }}.lxd";
         proxy_pass $container;