NC12 SetEnv NEXTCLOUD_CONFIG_DIR

Hello,
i have found the pull request regarding overwriting the nc config dir:

I tried to setup my apache with nc12 and php7 to use this variable. Does anyone know if it is still working?

I moved the config dir from webroot/config to webroot/nc1/config and set the NEXTCLOUD_CONFIG_DIR in apache like below.
nextcloud.log says the following:
Unable to create file /srv/www/test/web/config/config.php because No such file or directory

My apache config looks like this:
<vhost …>


Options +FollowSymlinks
AllowOverride All

Dav off

SetEnv NEXTCLOUD_CONFIG_DIR=/srv/www/test/web/nc1/config
SetEnv HOME /srv/www/test/web
SetEnv HTTP_HOME /srv/www/test/web

Thanks
Nico