Custom user/password

[javierspn]

Is your feature request related to a problem? Please describe.
None at all!

Describe the solution you'd like
Hi Scotty! your image works like a breeze. So much that I am considering using it as a permanent solution for a disposable bastion machine. However I would like to know if There is an easy way to set up a custom user/pass, for added security.

Describe alternatives you've considered
Create a persistent volume on the hosts (currently running on a swarm) and change the password. Not tried yet, will likely do.