Almost taken from below:
- https://github.com/circleci/circleci-images
- https://circleci.com/gh/circleci/circleci-images/tree/master
- https://2699-85091879-gh.circle-artifacts.com/0/circleci-bundles/ruby/images/2.4.2-stretch/Dockerfile
- https://2699-85091879-gh.circle-artifacts.com/0/circleci-bundles/ruby/images/2.4.2-stretch/node/Dockerfile
- https://2699-85091879-gh.circle-artifacts.com/0/circleci-bundles/ruby/images/2.4.2-stretch/node-browsers/Dockerfile
- https://github.com/noonat/docker-rbenv-nodenv/blob/master/Dockerfile