Add action for useful PR commands

[jdhoffa]

It is possible to ask GitHub to run common commands like roxygen2::roxygenise() to document a package, or styler::style_pkg() directly from GitHub. It will then commit the results to the PR. You do so by typing \style or \document as a comment on the GH PR.

I know @cjyetman doesn't particularly like things that make commits for him, but these are entirely opt-in (meaning people that want to use them can use them, and people that don't don't need to).

See here: https://github.com/RMI-PACTA/r2dii.data/blob/main/.github/workflows/pr-commands.yaml

[cjyetman]

yes it's possible. yes I don't like 😄

[jdhoffa]

Would still be nice to have it in this repo so that maintainers can optionally include it (the ones that want it)

[cjyetman]

Note that there are many ways to trigger a workflow. I always felt like the "\style" comment was a bit hacky. Could also be something like labelling a PR with a "auto-style" label or something.

[jdhoffa]

¯_(ツ)_/¯ i'm not really picky about how to trigger it tbh.

Happy if you want to do it a custom way via labels, but I wolud prefer to just leave it the way r-lib does it so we don't unnecessarily add extra maintenance burden on ourselves if we don't have to (even if it's a tiny burden lol)

[AlexAxthelm]

NB: since I'm expecting everything in the actions repo to be invoked with

on:
  workflow_call:

anything that's invoked on comment will need to have a workflow file in the content repo:

.github
\- workflows
    |- docker.yml
    |- R-package.yml
   \- comments.yml