Github Action with interactive ssh password support

[SonOfBytes]

@psviderski. The request from @luojiyin1987 within the github action is to use SSH passwords in the GitHub action flow. As discussed here #16 ssh passwords are supported in docker pussh interactively and there is no support for automation.

The workaround out there on the internet for automating interactive passwords on ssh is to use sshpass. In this case the suggested solution by @luojiyin1987 is to wrap docker pussh in sshpass which in turn wraps the ControlMaster connection (I think) ssh "${ssh_opts[@]}" -f -N "${target}"

I have concerns to be extending functionality of docker pussh in the action as per the PR kindly put together by @luojiyin1987.

@psviderski what are your thoughts on enabling automated ssh password in unregistry?