Create functionality to post validation results to PRs as comments

[annakrystalli]

Instead of having to inspect GitHub actions, create functionality to post validation results to PRs as comments. Such functionality already exists in other hubs.

• [ ] Update validate-pr vignette in hubValidations to mention validation results as PR comments

Links to relevant resources:

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[elray1]

The interactions with github in the us covid hub's current system are using a python library, so probably won't be that useful. see function here

There may be more useful stuff for our purposes in Hugo's work in R?

[elray1]

wondering if this issue would be better suited on hubValidations, imagining that PR comments would be created by a function like hubValidations::validate_pr?

[annakrystalli]

The reason I've added this to this repo is I suspect we might be able to sort the functionality out through GitHub actions mainly e.g.

• https://stackoverflow.com/questions/58066966/commenting-a-pull-request-in-a-github-action
• and more specifically https://github.com/thollander/actions-comment-pull-request#comment-pull-request---github-actions

[annakrystalli]

Although admittedly validate_pr() will likely need to be slightly modified also. Times like this I wish issues could be shared between repos!