mdk init does not ask for mariadb credentials

[dionysius]

Basically what title says. When using mdk init, you get asked for user/pass for mysql and postgres, but not for mariadb. That explains, that the db-credentials config.php after mdk create ... still are root/root.

You can manually edit .moodle-sdk/config.json and add a [mariadb] section for sure. But it took me 20 attepts to realise it is never using the credentials I expected mdk init to set.