Automatically confirm existing LDAP users

Users from before the akkounts app existed can log in without an extra
email confirmation.

app/models/user.rb

@@ -8,8 +8,14 @@ class User < ApplicationRecord
 
   def ldap_before_save
     self.email = Devise::LDAP::Adapter.get_ldap_param(self.cn, "mail").first
+
     dn = Devise::LDAP::Adapter.get_ldap_param(self.cn, "dn")
     self.ou = dn.split(',').select{|e| e[0..1] == "ou"}.first.delete_prefix("ou=")
+
+    if self.confirmed_at.blank? && self.confirmation_token.blank?
+      # User had an account with a trusted email address before akkounts was a thing
+      self.confirmed_at = DateTime.now
+    end
   end
 
   def reset_password(new_password, new_password_confirmation)