Try passman

Once you click the following button you will be to a newly created Nextcloud instance only for you, with passman installed on it.
It will only be alive for an hour (1) and after that it will go into void. Meanwhile you can do anything you want with it, have fun!

The default username and password are:
Username: admin
Password: admin

Setting up an instance takes about 15 seconds, please be patient.

Status: Not running . . . . .