Add Vagrantfile for local testing

Signed-off-by: Derek Nola <derek.nola@suse.com>

roles/k3s/server/tasks/main.yml

@@ -87,6 +87,7 @@
       when: ansible_hostname != groups['server'][0]
 
     - name: Verify that all server nodes joined
+      when: (groups['server'] | length) > 1
       ansible.builtin.command:
         cmd: >
           k3s kubectl get nodes -l "node-role.kubernetes.io/control-plane=true" -o=jsonpath="{.items[*].metadata.name}"