I'm dreaming of a (hosted) RStudio CI/CD

As far as packages and CI / CD are concerned, I think some valuable thoughts / discussion can be had in these topics:

I think the latter makes a point about when would you clone the git repository / kick things off? Would you be looking for a Git hook that you control, or would you be looking for a service that would be watching the Git repo for tags / commits on a certain branch to trigger a build? You also might think about a timeline - maybe kick off a build / test every week even if no commits have made it to master?