Make domain and www root configurable in Nextcloud role

role/manifests/nextcloud.pp

 # A Nextcloud system
-class role::nextcloud {
+class role::nextcloud (
+  String $domain = lookup('profile::nextcloud::domain', String, 'first', undef),
+  String $www_root = "/var/www/${domain}",
+) {
   include profile::nextcloud
   include profile::firewall::web
 
@@ -31,9 +34,7 @@ class role::nextcloud {
   ],
 );"
 
-  $domain = lookup('profile::nextcloud::domain', String, 'first', undef)
-
-  file { "/var/www/${domain}/config/memory-cache.distributed.config.php":
+  file { "${www_root}/config/memory-cache.distributed.config.php":
     ensure  => 'file',
     mode    => '0640',
     owner   => 'www-data',