Schedule for auto-deploy branches during the weekend
From #815 (comment 347201357):
on Slack @jarv asked:
any reason why we exclude Saturday?
Once we started this experiment we were still trying to figure out the stability of master branch.
We knew that changelock periods will have protected canary and prod from weekend deployment, but we thought that in case of an outage, it would have been easier to be on the same auto-deploy branch we deployed Friday.
As an evolution to this reasoning, we may consider removing the Sunday branch as well, we didn't on the first iteration simply because the Sunday branch was already in the schedule.
This is a separate topic that we should discuss, but the point of Sunday UTC deployment is that we get a deployment to staging for APAC region's Monday. I think that is a good reason to keep these promotions, but we might want to consider adjusting the time. If we adjust the time, we could ensure that a deployment reaches canary during Monday shift in APAC.