How do you wait until a revision is ready before switching traffic to it?

[onionhammer]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [ ] feature request
- [x] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

It seems once the github action kicks off to update the ARM resources, your container app will be offline/unresponsive until that new revision has fully started up. The previous revision's traffic will be revoked instantly even though the new revision is not ready