Add global setting for default services, enable for preconfirmed accounts

Co-authored-by: Greg Karékinian <greg@karekinian.com>

app/models/user.rb

@@ -93,9 +93,7 @@ class User < ApplicationRecord
       LdapManager::UpdateEmail.call(dn: self.dn, address: self.email)
     else
       # E-Mail from signup confirmed (i.e. account activation)
-
-      # TODO Make configurable, only activate globally enabled services
-      enable_service %w[ discourse gitea mediawiki xmpp ]
+      enable_default_services
 
       # TODO enable in development when we have easy setup of ejabberd etc.
       return if Rails.env.development? || !Setting.ejabberd_enabled?
@@ -141,6 +139,10 @@ class User < ApplicationRecord
     self.errors[attribute_name].blank?
   end
 
+  def enable_default_services
+    enable_service Setting.default_services
+  end
+
   def ln_create_invoice(payload)
     lndhub = Lndhub.new
     lndhub.authenticate self