Find an easy way to trigger Github Actions tests if dev gets updated

[Lucas-Mc]

As mentioned in #1320, there's not currently a known way to easily re-run the Github Actions tests if the target (usually dev) gets updated while the desired pull request remains stagnant (tests are only triggered by direct commits to the pull request).

I think the only way to re-trigger the test if the target gets updated is to:

1. There's actually an option to re-run the tests but ONLY IF THEY FAIL for some reason
2. Push an empty commit, but then you have to squash/rebase and it's a lot of work
3. I've noticed from WFDB-Python that rebasing on dev then force pushing also re-triggers the test even though, likely, nothing directly related to the pull request changes

So yeah, not ideal at the moment so let's figure out if there's a better way!