add os_purpose

Signed-off-by: Jan Schoone <jan.schoone@uhurutec.com>

Author: jschoone

providers/openstack/scs2/kubernetes.yaml

@@ -18,6 +18,7 @@ images:
       hw_watchdog_action: reset
       hypervisor_type: qemu
       os_distro: ubuntu
+      os_purpose: k8snode
       replace_frequency: never
       uuid_validity: none
       provided_until: none