Add Docker-way?

[okainov]

I think it would help the project to be more reusable if you provide some Dockerfile, build instructions and, consequently, way to run comma from Docker.

Today, "How to run" section only lists "systemd" way which I feel is way less "standard" rather than Dockerfile or docker-compose or anything similar.

[Dieterbe]

a Dockerfile would make sense.
a docker-compose configuration also makes sense, though i think that's more for development

if you use these (or anyone else reading this), feel free to contribute these files. i personally am happy with a systemd unit.