tests/docker: add zstdtools to the images

We need this to be able to run the tuxrun_baseline tests in CI which
in turn helps us reduce overhead running other tests. We need to
update libvirt-ci and refresh the generated files by running 'make
lcitool-refresh' to get the new mapping.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230228190653.1602033-24-alex.bennee@linaro.org>

tests/docker/dockerfiles/ubuntu2004.docker

@@ -126,7 +126,8 @@ RUN export DEBIAN_FRONTEND=noninteractive && \
                       tesseract-ocr \
                       tesseract-ocr-eng \
                       xfslibs-dev \
-                      zlib1g-dev && \
+                      zlib1g-dev \
+                      zstd && \
     eatmydata apt-get autoremove -y && \
     eatmydata apt-get autoclean -y && \
     sed -Ei 's,^# (en_US\.UTF-8 .*)$,\1,' /etc/locale.gen && \