add listen directive to enable IPv6

docs/changelog.rst

@@ -1,6 +1,8 @@
 Changelog
 =========
 
+* :bug:`-` add listen directive to enable IPv6
+
 * :release:`0.1.1 <2015-01-27>`
 * :bug:`-` force symlink creation for enable_web_vhost task to make it
   idempotent

gvaweb/webtasks/templates/vhost.nginx

@@ -4,6 +4,8 @@ server {
     server_name *.{{ domain|parentdomain }};
     {%- endif %}
 
+    listen [::]:80;
+
     access_log /var/log/nginx/{{ domain }}.access.log;
     error_log /var/log/nginx/{{ domain }}.error.log;