We do run tests on some cross builds. Provide a template to ensure we
export the testlog to the build artefacts and report the test results
via the junit.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20230228190653.1602033-13-alex.bennee@linaro.org>