Blue/green deployments

[KendallWeihe]

We have an application use case of serving live traffic with limited downtime. We also have an acceptance test suite. I would like FTL to support blue/green deployments so that I can deploy new changes without impacting the existing production traffic, run the acceptance test suite against the staged deployment, and upon passing the acceptance test swap the blue/green deployments.

There's also the added benefit wherein during a case where the acceptance test suite fails to catch a bug, and that bug makes it to production, a swap back to the prior blue/green state would be a quick rollback mechanism.