fix: add configuration for building container images

[fsrv-xyz]

See #229 for reference

[braydonk]

Thank you for the PR! Seems like it will be useful to people. Left some comments on the Dockerfile. I'm certainly not a Docker expert, but making a few suggestions from other single-Go-binary Dockerfiles I've made.

[braydonk]

Forgot to add in my comment: could you also amend the documentation to provide instructions for where to pull the container from and some usage examples?

[fsrv-xyz]

I have added some documentation and adjustments to the Dockerfile which ensures the WORKDIR (for the usecase of running the docker image locally) is explicitly specified.

[braydonk]

I have a non-blocking comment, but otherwise LGTM.

In an effort to save potential issues, since I will not be online again til Jan 2 I am going to wait until then to merge and cut the release with this. If there were an issue I wouldn't be online to solve it, and no one else would be around with permissions on this repo.

Thank you for the feature!

[braydonk]

Could you also add the license header to the Dockerfile? Should be able to just run make install_tools addlicense

You did it at the same time as I made the comment; thanks!