signer: Check the list of android image files

BUG=b:230434967
BRANCH=None
TEST=Run ./sign_official_build.sh locally

Signed-off-by: Daichi Hirono <hirono@chromium.org>

Change-Id: I5e8b4d848f30f53fae58c721c9b7ddcfbfea9852
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3607891
Tested-by: Daichi Hirono <hirono@chromium.org>
Commit-Queue: Daichi Hirono <hirono@chromium.org>
Reviewed-by: Shao-Chuan Lee <shaochuan@chromium.org>
1 file changed