refactor(k3s): enhance kubeconfig generation and token management

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

roles/k3s_server/tasks/main.yml

@@ -1,2 +1,21 @@
 ---
+- name: See if k3s file exists
+  ansible.builtin.stat:
+    path: /usr/local/bin/k3s
+  register: k3s_status
+
 - include_tasks: installation.yml
+  when: not k3s_status.stat.exists
+
+- include_tasks: create_kubeconfig.yml
+  when: ansible_default_ipv4.address == k3s_primary_server_ip
+
+- name: Check if k3s token vault file already exists
+  ansible.builtin.stat:
+    path: "{{ playbook_dir }}/{{ k3s_server_token_vault_file }}"
+  register: k3s_vault_file_stat
+  delegate_to: localhost
+  run_once: true
+
+- include_tasks: pull_token.yml
+  when: not k3s_vault_file_stat.stat.exists