Add Dockerfile & build/push task

[nathanthorpe]

• Add Dockerfile and action to build and publish a docker image to GitHub Container Registry.
• Add documentation on how to run the docker image.

Note that it only pushes the docker image on a release, so using the releases option in GitHub is required.

It would be nice to have an official docker image for running on container platforms.

@seanthegeek I'm curious if you prefer to use ghcr or DockerHub. If you want to use DockerHub then I will remove the push action. Also let me know your thoughts on the release process.

If this is merged, please use the Squash and merge option so that the test commits are squashed.

[codecov[bot]]

Codecov Report

Merging #316 (230314e) into master (bfd1aa8) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #316   +/-   ##
=======================================
  Coverage   61.40%   61.40%           
=======================================
  Files           8        8           
  Lines        1241     1241           
=======================================
  Hits          762      762           
  Misses        479      479           

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update bfd1aa8...230314e. Read the comment docs.

[seanthegeek]

Thanks! Your implementation of a container looks much cleaner than some others I have seen. My goal for this weekend is to start using GitHub releases to deploy documentation and packages, instead of manually deploying new releases.