Pod init container for setting outputs path.

def get_init_container(self,
                           init_command,
                           init_args,
                           env_vars,
                           context_mounts,
                           persistence_outputs,
                           persistence_data):
        """Pod init container for setting outputs path."""
        env_vars = to_list(env_vars, check_none=True)
        env_vars += [
            get_env_var(name=constants.CONFIG_MAP_JOB_INFO_KEY_NAME,
                        value=json.dumps(self.labels)),
        ]
        return client.V1Container(
            name=self.init_container_name,
            image=self.init_docker_image,
            image_pull_policy=self.init_docker_image_pull_policy,
            command=init_command,
            env=env_vars,
            args=init_args,
            volume_mounts=context_mounts)