fix(k3s_server): use VIP address in kubeconfig instead of k3s_server_name

k3s_server_name resolves to k3s.seyshiro.de which has no DNS entry.
Use k3s_vip (192.168.20.2) so the kubeconfig always works.

roles/k3s_server/tasks/create_kubeconfig.yaml

@@ -46,7 +46,7 @@
 - name: Add K3s cluster to kubeconfig
   ansible.builtin.command: >
     kubectl config set-cluster "{{ k3s_cluster_name }}"
-    --server="https://{{ k3s_server_name }}:6443"
+    --server="https://{{ k3s_vip }}:6443"
     --certificate-authority=/tmp/k3s-ca.crt
     --embed-certs=true
   environment: