Integrated deployment via ssh

[roberth]

We've been deploying over ssh which is nice and simple, but not as easy as it should. More importantly, knowing how deployment is done will help with other features like secrets.

Options:

• local docker (default) which allows bind mounts, useHostStore etc
• remote docker, which doesn't allow bind mounts, requires ssh session management
• in the future: swarm (out of scope here)