Kubernets gitlab-runner should allow for nfs mounts in addition to pvc

Problem to solve

Kubernetes now allows for nfs volume type without requiring a pvc.

Configuration

Something like:

        [[runners.kubernetes.volumes.nfs]]
          name = "ssl-certs"
          server = 1.2.3.4
          path = "/nfs/ssl-certs"
          readOnly = true
          mount_path = "/etc/ssl/certs"