Lighter weight dependency installation

[hadley]

If you just want to quickly render an Rmd or quarto file, it'd be nice to have some way to install dependencies without either adding a DESCRIPTION or fully committing to the renv lifestyle. i.e. could provide an action that does something like pak::pak(unique(renv::dependencies()$Package)) ?

Obviously this isn't going to provide long-term reproducibility, but a lot of the time that's not what you need. You just want to get something quick and dirty running, and it's fine if it fails in a couple of months because you're probably done with it by then anyway.