Concurrent deployments

Back in September, Frank Wang posted an SST announcement that talked about Concurrent Deployments. It’s unclear to me how to configure SST to deploy a stack to, say, several regions at a time,

In this particular case, I want to deploy a cross-region EventBridge rule to multiple regions.

Is there documentation or an example available that would show me how to concurrently deploy an SST stack to many regions simultaneously?

I’m not totally sure which announcement this is. But you can do this in Seed, you can configure stages with multiple regions and it’ll deploy to them concurrently.