[oneplane]

I think there isn't an exact term for this yet, it's a bit of a blend between ephemeral environments and skaffold. There have been a few in-house implementations at various companies where they use Istio and combinations of VirtualService and DestinationRule resources to create multi version environment and nested environments without having to change the application code, and this seems to be something like that, but local (hence the Skaffold reference).

Your project is probably going to be useful for some (who want it locally), and an inspiration for others (who want to build something similar but for their custom platform) as it can be pretty tricky in a world were we still have people doing things manually (i.e. running kubectl apply in production).