Have URLs periodically checked

[cansavvy]

I'd love to have something that periodically checks the urls on my courses even if I haven't filed a pull request and then if can alert me to broken ones that would be perfect.

I know this is possible with GitHub actions, I'd just need to set it up.

[cansavvy]

I'll make this a priority too because it should be a fairly quick add. should....

[cansavvy]

That was a lie. I did not make this a priority. But now this would be a good issue for @howardbaek to do to get familiar with OTTR. So let’s chat about it.

[howardbaik]

This post suggests a GHA for periodically checking for broken links using the schedule event.

Also, it seems like GHA natively sends email notifications: https://docs.github.com/en/actions/monitoring-and-troubleshooting-workflows/notifications-for-workflow-runs

[cansavvy]

The other thing that would be great for this, is to have it create a new branch and file a pull request that tells someone what the broken URLs are. That way there's already the branch they can check out to fix it.

Grab code from here:
https://github.com/jhudsl/OTTR_Template/blob/main/.github/workflows/pull_request.yml