Add very basic docker support

[peauc]

Fix #222

Add basic docker support for self hosted build

[Arkaeriit]

Devzat uses the file system to store ssh keys, server configuration, and user configuration. All those should be permanent after a Devzat restart. I am not a Docker expert but it looks like the files are erased after closing the docker container.

[quackduck]

What's the relationship here with the other docker pr?

[peauc]

@quackduck there is none, im closing this one