Display / set / update the ECS secret access key.

def secret_access_key(ecs_secret_access_key):
    """Display / set / update the ECS secret access key."""
    if not ecs_secret_access_key:
        click.secho(dtool_config.utils.get_ecs_secret_access_key(CONFIG_PATH))
    else:
        click.secho(dtool_config.utils.set_ecs_secret_access_key(
            CONFIG_PATH,
            ecs_secret_access_key
        ))