Some folks need to deploy Ruby applications on Windows (with native Windows libraries), so the ruby docker-library should support a windows base image. The python base images for windows are [based on windowsservercore](https://github.com/docker-library/python/blob/db2d58d73043c85ceecc8e675372b4dc6a77d136/2.7/windows/windowsservercore/Dockerfile) which is enormous, but it could probably copy everything over to a nano image with a multi-stage build. I've done that with [my Ruby base image](https://github.com/woodie/nanoserver-ruby/blob/master/Dockerfile). [DevKit includes bash](http://rubyonwindowsguides.github.io/book/ch02-04.html), so we can probably do all the same setup at the other ruby images in bash.