PoC: accessible iggy-cmd from web GUI

[hubcio]

The idea is to start ssh server inside iggy-server docker container, add new user with minimal priviliges, add iggy-cmd to PATH.

In the web gui, it should be possible to ssh user@server:port and see output of terminal.

Main purpose of this is to access this terminal, and use iggy-cmd thru it. (so it would be good to have nice ssh hello msg)