Starlark (python like config language) is used to configure Clace. For containerized apps, python frameworks are supported without a Dockerfile being required. All other languages currently require a user provided Dockerfile, the `container` spec can be used.

I do plan to add specs for other languages. New specs have to be added here https://github.com/claceio/appspecs. New specs can be created locally also in the config, see https://clace.io/docs/develop/#building-apps-from-spec