IDEA: GirHub action for validating your own packages.json

[HenrikBengtsson]

I often find myself doing silly mistakes when setting up my packages.json, e.g. using the wrong url, forgetting subdir, or using the wrong branch.

It's really hard to troubleshoot such mistakes - yet, know that you should troubleshoot them.

Having a GitHub action, or a job template for doing basic validation of the packages.json file could validate each package config and make sure an R package is truly found at the specified location.