Container with CUDA support

[arunoruto]

Since there are a lot of projects which need CUDA to operate, it would be sweet if there was a prebuilt docker image with CUDA provided in it! Nvidia provides already docker images with CUDA in them, and they should be based on ubuntu/debian. If you are currently busy, I can try and make it myself and then make a pull request :)

P.S. the container could also default to the dask-cuda worker command dask-cuda-worker instead of the normal dask-worker.