Hey, it's been a while, right?

Lately, I'm leading some big changes in our infrastrure since I'm wrapping a Blue/Green deployment into another one. Uh?

Long story short: our product runs on AWS ECS Docker containers, and because we have one sub-domain per app instance, we use Apache wildcard sub-domains. Meaning a single container handles traffic from many clients/instances. We already have a Blue/Green deployment process in place but at the Docker container level, not at the client level. The idea is to entirely duplicate the whole stack (with all its flaws) and a sub-domain pointing to