PSA: If you can't login to qBittorrent (pass: adminadmin) check the container log .

This is added in a new update or something. If qBittorrent detects a password was not set, instead of allowing you to login using the default password: adminadmin. it will produce a random password, you can find it in the container log.

The message should be:

"The WebUI administrator password was not set. A temporary password is provided for this session: _your_password_here_"