I don't have much experience building packages, and I'm still a little confused. This might be obvious, but where do I start?
If you would like to add support, please send a PR adding the feedstock name to the above list. After that PR is merged, you can monitor the status at conda-forge status-page https://conda-forge.org/status/#armosxaddition and if a particular PR is stalled you can send a PR to the feedstock to fix it.
Or do I start by modifying the conda-forge.yml file in a cloned repo?
Add the following to conda-forge.yml (on Linux or OSX),
r-tidyverseat the bottom