wasp build produces artfeacts like static files for client and Dockerfile for server, but there is no simple way to run then, you have to figure out commands to run that Dockerfile on your own, and also serve those static files correctly, set up env vars, ... .

What most frameworks have is a way to easily try out the code produced by wasp build, and we should have the same thing, it should run it for you, locally, but similarly like it would run for real, so you can that way test the built app.