We would like to stand up a bare dagster server into which, over time, we will deploy dagster-ready packages with their own repositories, workspace.yaml etc. Initially, when it is stood up, the only packages deployed to the server are the dagster core libs and dagit. Dagit will be started and point to a workspace.yaml. The workspace.yaml is expected to grow over time as we add python_package entries to it. Initially however, we need to point to something - a package, a module that will allow dagit to start. I notice there is a dagit_tests.toy.bar_repo that seems to do the trick. Can this be relied on to always be present or is there another better alternative?