The tests works by executing osbuild with predefined pipeline. Then the
image boots and the testing script creates SSH connection to the running
VM. If everything goes fine `systemctl is-system-running` is executed
with result `running` and the test case passed.
The JSON definition of the test case contains also a blueprint that
should generate the desired pipeline, but it didn't work for me, so I'm
including it for future use from the golang unit tests.