feat(playbook.yml): create caddy group

playbook.yml

@@ -2,7 +2,12 @@
 - name: Deploy Caddy
   hosts: all
   tasks:
-    - name: Create caddy user
+    - name: Ensure group "caddy" exists
+      ansible.builtin.group:
+        name: caddy
+        state: present
+
+    - name: Ensure user "caddy" exists
       user:
         name: caddy
         system: yes