feat(pb,role,task): makes VM deployment playbook use new validation pre_tasks, become_method and os_template tasks are shared now

tasks/os_template_validation.yaml

@@ -0,0 +1,22 @@
+--- 
+
+- name: Set default OS template
+  ansible.builtin.set_fact:
+    guest_os_template: "debian-13"
+
+- name: Prompt for OS template with immediate validation
+  ansible.builtin.pause:
+    prompt: "Choose OS template, available: debian-13, alpine [debian-13]"
+  register: os_template_result
+  until: >
+    os_template_result.user_input | length == 0 or
+    (
+      os_template_result.user_input in ['debian-13', 'alpine'] 
+    )
+  retries: 2
+  delay: 0
+
+- name: Use user input only if provided, otherwise keep the default
+  ansible.builtin.set_fact:
+    guest_os_template: "{{ os_template_result.user_input }}"
+  when: os_template_result.user_input | length > 0