If we are in a fork of the project, we would like to be able
to overwrite the `:latest` tag if the registry from any branch
so we won't have to manually overwrite the image tag in the
build/test jobs in the .gitlab-ci.yml file
Make it so when we build a new image in `gst-ci` it gets
picked up automatically by the job in this repo. For the template
itself we want the images to me be versioned and reproducible.
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.
