Added k3s agents

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

roles/k3s_agent/handlers/main.yml

@@ -0,0 +1,6 @@
+---
+- name: Restart k3s
+  service:
+    name: k3s
+    state: restarted
+  become: yes

roles/k3s_agent/tasks/installation.yml

@@ -0,0 +1,21 @@
+---
+- name: See if k3s file exists
+  stat:
+    path: /usr/local/bin/k3s
+  register: k3s_status
+
+- name: Download K3s install script to /tmp/
+  when: not k3s_status.stat.exists
+  ansible.builtin.get_url:
+    url: https://get.k3s.io
+    dest: /tmp/k3s_install.sh
+    mode: "0755"
+
+- name: Install K3s on the secondary servers
+  when: not k3s_status.stat.exists
+  command: |
+    /tmp/k3s_install.sh
+  environment:
+    K3S_URL: "https://{{ k3s.loadbalancer.ip }}:{{k3s.loadbalancer.default_port}}"
+    K3S_TOKEN: "{{ k3s_token }}"
+  become: true

roles/k3s_agent/tasks/main.yml

@@ -0,0 +1,2 @@
+---
+- include_tasks: installation.yml