[DOC] Include Docker instructions to install a subset of RAPIDS libraries #646
Description
In the installation instruction https://docs.rapids.ai/install/#docker we have guides on how to install RAPIDS, but sometimes users only want to install a subset of the libraries (e.g cuml and cudf) via docker and we don't have clear instructions for this.
We should a Dockerfile + instructions that showcases how to do this via a conda env in a yaml file.
If people agree, where would be the place in the docs that this should live?
xref: rapidsai/deployment#582