How to use the dazel.DockerInstance function in dazel

def _start_run_deps(self):
        """Starts the containers that are marked as runtime dependencies."""
        for (run_dep_image, run_dep_name) in self.run_deps:
            run_dep_instance = DockerInstance(
                instance_name=run_dep_name,
                image_name=run_dep_image,
                run_command=None,
                docker_command=None,
                dockerfile=None,
                repository=None,
                directory=None,
                command=None,
                volumes=None,
                ports=None,
                network=self.network,
                run_deps=None,
                docker_compose_file=None,
                docker_compose_command=None,
                docker_compose_project_name=None,
                docker_compose_services=None,

def from_config(cls):
        config = cls._config_from_file()
        config.update(cls._config_from_environment())
        return DockerInstance(
                instance_name=config.get("DAZEL_INSTANCE_NAME", DEFAULT_INSTANCE_NAME),
                image_name=config.get("DAZEL_IMAGE_NAME", DEFAULT_IMAGE_NAME),
                run_command=config.get("DAZEL_RUN_COMMAND", DEFAULT_RUN_COMMAND),
                docker_command=config.get("DAZEL_DOCKER_COMMAND", DEFAULT_DOCKER_COMMAND),
                dockerfile=config.get("DAZEL_DOCKERFILE", DEFAULT_LOCAL_DOCKERFILE),
                repository=config.get("DAZEL_REPOSITORY", DEFAULT_REMOTE_REPOSITORY),
                directory=config.get("DAZEL_DIRECTORY", DEFAULT_DIRECTORY),
                command=config.get("DAZEL_COMMAND", DEFAULT_COMMAND),
                volumes=config.get("DAZEL_VOLUMES", DEFAULT_VOLUMES),
                ports=config.get("DAZEL_PORTS", DEFAULT_PORTS),
                env_vars=config.get("DAZEL_ENV_VARS", DEFAULT_ENV_VARS),
                network=config.get("DAZEL_NETWORK", DEFAULT_NETWORK),
                run_deps=config.get("DAZEL_RUN_DEPS", DEFAULT_RUN_DEPS),
                docker_compose_file=config.get("DAZEL_DOCKER_COMPOSE_FILE",
                                               DEFAULT_DOCKER_COMPOSE_FILE),
                docker_compose_command=config.get("DAZEL_DOCKER_COMPOSE_COMMAND",