Feature/add docker support

[ntkach]

Assuming that you define these variables somehow (whether that's export="something" in the shell, putting them in a .env file that goes into the image) these files should allow you to do a

docker build .

Then you can do what you want with that image. I actually am using it insider Rancher, so the docker-compose.yml here may not work as-is (complains about the docker-compose.yml using an image).

[kenahrens]

Thanks for adding these docker files, I'm going to add some details into the README with how to use them. I appreciate the help. 💯