I don't believe I've noticed it in the docs, but does sst.json support defining multiple environments?

The default stage has to be a single stage. I meant adding a new config for specifying a list of stages as guards.

Yeah, the guard idea makes sense. I was just wondering if the sst.json was meant to define multiple environments (e.g. staging, dev, prod, etc) vs a single default configuration

Yeah, a single default environment