config.nix

      config = {
        # Inject the flakes parameter into the container's evaluation
        # environment. Because of the way declarative containers work,
        # they don't get evaluated with the full module context of their
        # parent, and don't provide a handy place to inject
        # this. Fortunately, doing the obvious thing of "smash the value
        # into the module by hand" seems to work correctly, muahahah.
        _module.args.flakes = flakes;

      };