[WIP] [MORPHY] Switch to GitHub Actions

[Fryguy]

This backports #21683 to morphy, so we can get some testing on PRs there.

[miq-bot]

This pull request has been automatically marked as stale because it has not been updated for at least 3 months.

If these changes are still valid, please remove the stale label, make any changes requested by reviewers (if any), and ensure that this issue is being looked at by the assigned/reviewer(s).