Disallow images in pigweed.git Bug: b/387546904 Change-Id: I1a1e8a13f608ed4902971fea3d1517af8ac56479 Reviewed-on: https://pigweed-review.googlesource.com/c/Pigweed-Base/+/257834 Reviewed-by: Ted Pudlik <tpudlik@google.com>