chore 📦: Update setupacdc.yml to include pexpect installation for Ansible controller

Added a new task to install pexpect on the Ansible controller, ensuring it's installed via apk. This change is part of the setup process and will enable the use of pexpect in future tasks.

tasks/setupacdc.yml

@@ -1,4 +1,15 @@
 ---
+- name: Install pexpect on Ansible controller
+  hosts: localhost
+  gather_facts: false
+
+  tasks:
+
+    - name: Ensure pexpect is installed via apk
+      ansible.builtin.apk:
+        name: py3-pexpect
+        state: present
+
 - name: Create and provision LXC container on Proxmox
   hosts: node0
   gather_facts: no