Implement zero-downtime updates for Oasis

[kentonv]

Currently, updating Oasis requires ~10 minutes of downtime and happens approximately weekly. Eventually, we will implement zero-downtime rolling updates. For now, downtime alerts may link to this issue.

To find out what's changing, compare the Sandstorm changelog with the current Oasis version listed on the Oasis about page.

[dckc]

I suggest closing this as wontfix since Oasis is going away.

cc @ocdtrekkie

[ocdtrekkie]

I thought about this actually. But I think what I want to do is maybe move this issue to the Blackrock repository, as it is a Blackrock issue. And we are not too concerned about Blackrock issues right now, but should still track them.