Adding support for R in ml-hub

[jbschiratti]

As a data scientist, I use both R and Python and would really appreciate if R (say, version 4.0.3) was part of ML-Hub. Adding R support could be optional (something like docker build -t . --build_arg R_SUPPPORT=True). R can be installed, for instance, using apt-get.

[raethlein]

Hey @jbschiratti, thanks a lot for your suggestion! Specific libraries or tools are better discussed in the ml-workspace repository as the hub is only there for administering the workspaces. Though I am delighted to say that we already have an ml-workspace flavor where R is installed: mltooling/ml-workspace-r. I hope this fits your needs! Currently, we are updating the workspace with regards to library and tool versions etc. so we hopefully can publish an updated version soon :)