Right now we only have one test against build_manifest.py, it
is not needed to run this test if that code haven't changed.
It's really easy to add more file or set a wild card in the
future.
In order to be able to query the Gitlab Group API we need to be
authenticated. CI_JOB_TOKEN for public jobs has a non-meaningfull
value which does not actually authenticate the Runner to the
intance.