added dockerfile for nvidia cuda

[fernandonieuwveldt]

This is a docker container for use with cuda/gpu.

To build: docker build . -t julia:gpu
To spin up container with gpu usage: docker run --gpus all -it --rm julia:gpu bash

This does not use the julia cuda artifact but rather the local(in container) cuda installation.
To use local(container) cuda installation the environment variable JULIA_CUDA_USE_BINARYBUILDER is set to false

CUDA examples on CUDA.jl page ran successfully.

[tianon]

While this is interesting (and I hope you continue working on it!), I don't think the official image is the appropriate place for such a variant to be maintained.

[fernandonieuwveldt]

Ok thanks for your reply. I will close the PR.