Add kubectl-nsenter as a cli binary on server

[gberche-orange]

As k8s cluster operator,
in order to troubleshoot networking issues within containers,
I need to use https://github.com/pabateman/kubectl-nsenter to ease the operations to enter linux namespaces associated with containers

See https://github.com/orange-cloudfoundry/paas-templates/issues/2686 (private issue) for manual workaround in orange-specific environment

• fix .profile not being sources in sudo -i <cmd>, see sudo -i support within ssh command pabateman/kubectl-nsenter#108
• add crictl package to k3s-agent job (currently only available on k3s-server job)