Run GitHub Actions on a regular interval

[clpetix]

We should run GitHub actions on a regular interval so that we catch if the code breaks because of our dependencies (such as what happened with Numpy 2.0).

This will run our actions at 08:00 AM, on the first Tuesday of the month.

[mphoward]

Thank you! I think this is a good idea, but there are some caveats on scheduled jobs we need to be careful with. Please review the list here and let’s discuss via Slack after you’ve done so:

https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#schedule