SSH key embedded in docker image

[datashaman]

Copying the users' SSH keys into the Docker image is a security risk. Rather mount a volume when running the container:

docker run -it --rm -v $HOME/.ssh:/root/.ssh infinigen /bin/bash

This should also solve the installation issue where a user does not have that exact key in their SSH folder.

[araistrick]

Thanks! We will accept some or all of #22 as soon as our contributing pipeline is set up, hopefully tonight or tommorow.