from typing import List


def get_zero_positions_in_binary_mask(mask: List[int]) -> List[int]:
    """
    Return the indices of zero positions in a binary mask.

    :param mask: a mask that contains either 0s or 1s
    :return: List of indices of positions of zeros in a binary mask.
    """

    mask_zero_positions = [idx for (idx, channel) in enumerate(mask) if not channel]
    return mask_zero_positions