You build the VM one time, deploy it to dev. If all tests pass, you deploy the exact same VM to test/stage/prod/whatever. It's the diff between a new build (o

You build the VM one time, deploy it to dev. If all tests pass, you deploy the exact same VM to test/stage/prod/whatever. It's the diff between a new build (of the "same code") for each environment versus building up the VM one and deploy that.