signer: Handle zstd squashfs compression

BUG=b:193618692
TEST=sign_official_build.sh can handle zstd-compressed Android image

BRANCH=none
Signed-off-by: Satoshi Niwa <niwa@google.com>
Cq-Depend: chrome-internal:4024687
Change-Id: Ie01e93e49da9b32245055f7e4b6fa4fb3fbefd8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3066801
Tested-by: Satoshi Niwa <niwa@chromium.org>
Reviewed-by: Kazuhiro Inaba <kinaba@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Auto-Submit: Satoshi Niwa <niwa@chromium.org>
Commit-Queue: Satoshi Niwa <niwa@chromium.org>
1 file changed