Just the original docker with some features for customization.

set $MONGO["servers"][$i]["mongo_auth"] = true; in config.php. So login with user your admin user/pass.

Usually mongoDB is installed without admin as default. You should add admin user/pass first. You can try mongo command as follows:

use admin
db.createUser({user:"root",pwd:"root123",roles:["userAdminAnyDatabase"]}) 

Then you can use root/root123 to login.