tests/docker: update debian-armhf-cross with lcitool

Use lcitool to update debian-armhf-cross to a Debian 11 based system.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20220527153603.887929-7-alex.bennee@linaro.org>
4 files changed