Due to ongoing cleanup of runners https://cern.service-now.com/service-portal?id=outage&n=OTG0078219
python wasn't working in the new runners that have python3.
Changing the script to use python3 instead of python would also work in the new default runners tags: k8s-cvmfs
but I put here a specific image.
This might have to be rethought when the change to the new runners is complete.
Failing pipelines pass
Closes #