Lost Huginn Web GUI Userid and Password

[radry]

I can't remember my login credentials and I don't have an email server setup so I can't reset the password the usual way.

According to the closed issue #3139 , it should write the reset link (?) to a "log" but I wasn't able to determine WHICH logfile and where it is located.
I have huginn running via the docker image.

Please someone tell me where this mysterious log file is.