This container is created for the sake of proving that this tweet is possible: https://twitter.com/alvations/status/849864301720608768
DO NOT USE THIS FOR ANY SERIOUS THING!!!
You have only yourself to blame if this container causes you to lose/corrupt your data or hardware.
See https://jpetazzo.github.io/2015/09/03/do-not-use-docker-in-docker-for-ci/ for the consequences.
Here's the Dockerfile