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I saw #526, and thought it would be easier to maintain a Dockerfile (and potentially down the line, a Docker image) than try to support Ruby environments on different platforms for users unfamiliar with Ruby.
This addition shouldn't affect day-to-day development, but allows users to run Licensee with the following:
git clone https://github.com/licensee/licensee && cd licensee
docker build . --tag licensee
docker run licensee [COMMAND]
It could also be used to facilitate local development, if people would prefer to develop within the docker container, rather than not their system directly.
I've also added a tiny CI job to build the docker container and verify it works to reduce maintenance and prevent regressions down the line.
View rendered docs/README.md