Self sign-up has been disabled due to increased spam activity. If you want to get access, please send an email to a project owner (preferred) or at gitlab(at)nic(dot)cz. We apologize for the inconvenience.
It was suggested by one of our user on forum. It is enabled in OpenWrt 19.07 and master by this patch. Let's enable it also in OpenWrt 18.06. I put it to backport folder and will try to ask upstream if can they backport it to stable branch.