CTR: Add squashfs-tools to env

BUG=b:290133361
TEST=CQ

Change-Id: Ifa722767322aff59845c72c0f08ee7340185cd8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/4728821
Reviewed-by: Derek Beckett <dbeckett@chromium.org>
Commit-Queue: Alan Ding <alanding@chromium.org>
Reviewed-by: Kazuhiro Inaba <kinaba@chromium.org>
Tested-by: Alan Ding <alanding@chromium.org>
1 file changed