It seems we also need to pass DOCKER_BUILDKIT as an argument to docker
itself to get the full benefit of caching.
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Suggested-by: Fabiano Rosas <farosas@suse.de>
Tested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20230315174331.2959-3-alex.bennee@linaro.org>