cros-test: Install xz-utils for gscdevboard tast.

The gscqual archives are in .tar.xz archives which requires xz support
to extract.

BUG=b:562405995
TEST=None

Change-Id: I97da27eea952319a3f8bfe2f1a3cf620da3acf6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/8459385
Tested-by: Andrew Luo <aluo@chromium.org>
Reviewed-by: See Wai Fu <seewaifu@google.com>
Reviewed-by: Vadím Sukhomlínov <sukhomlinov@google.com>
Reviewed-by: Mary Ruthven <mruthven@chromium.org>
Auto-Submit: Andrew Luo <aluo@chromium.org>
Commit-Queue: Andrew Luo <aluo@chromium.org>

src/chromiumos/test/dockerfiles/cros-test/Dockerfile

diff --git a/src/chromiumos/test/dockerfiles/cros-test/Dockerfile b/src/chromiumos/test/dockerfiles/cros-test/Dockerfile
index 57b6560..d36cf8c 100644
--- a/src/chromiumos/test/dockerfiles/cros-test/Dockerfile
+++ b/src/chromiumos/test/dockerfiles/cros-test/Dockerfile
@@ -5,8 +5,8 @@
 # Inherit from prebuilt cros-test-full-base image containing google-cloud-cli, gcc, and bzip2
 FROM us-docker.pkg.dev/cros-registry/test-services/cros-test-full-base:prod_cros-test-full-base
 
-# Dependency of cheets_STS
-RUN apt-get update && apt-get install -y file fakeroot
+# Dependency of cheets_STS and tast-cmd (app-arch/xz-utils for .tar.xz extraction)
+RUN apt-get update && apt-get install -y file fakeroot xz-utils/bullseye
 
 # Config the user
 # dialout added for b/273797484