[Rd] R CMD check and CRAN's Rust policy

[Dirk Eddelbuettel]

It is also pretty straightforward to roll your own actions and / or use
different, simpler YAML setups. I still use a 'rolled forward and maintained
by me now version' of the shell script many of us started with at Travis CI.
It works, is portable across multiple CI backend, and is still a shell script
and easy to customize. I eventually added basic actions that fetch it / do
the setup.  Would be easy to deploy a modified rcmdcheck with it too. It only
covers linux (where it works rather well with r2u for speed, ease of use and
reliability) and macOS, both arm64 and x86_64. See [1] if interested.

Dirk

[1] https://eddelbuettel.github.io/r-ci/

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dirk.eddelbuettel.com | @eddelbuettel | edd using debian.org