CI: allow running on Kubernetes
Remove the docker
tag to allow the jobs to land on the new Kubernetes
infrastucture (OTG0078219). Also apply the recommended ulimit
fix for
centos7 images to avoid yum install
being very slow.
The ARM CI remains on docker
for the moment.
Relates to ATLINFR-5058. cc @akraszna @elmsheus
Edited by Frank Winklmeier