Use more efficient account lookup query for LDAP logins

Co-authored-by: Claire <[email protected]>

app/models/concerns/user/ldap_authenticable.rb

@@ -22,7 +22,7 @@ def ldap_get_user(attributes = {})
         safe_username = safe_username.gsub(keys, replacement)
       end
 
-      resource = joins(:account).find_by('accounts.username ILIKE ?', safe_username)
+      resource = joins(:account).merge(Account.where(Account.arel_table[:username].lower.eq safe_username.downcase)).take
 
       if resource.blank?
         resource = new(