refactor(virtualization): extract shared Xen disk definitions

roles/virtualization/tasks/xen.yml

@@ -2,27 +2,7 @@
 - name: Deploy VM on Xen
   block:
     - name: Build disk definitions
-      ansible.builtin.set_fact:
-        virtualization_xen_disks: "{{ virtualization_xen_disks | default([]) + [virtualization_xen_disk_cfg] }}"
-      vars:
-        device_letter_map: "{{ disk_letter_map }}"
-        device_letter: "{{ device_letter_map[ansible_loop.index0] }}"
-        virtualization_xen_disk_cfg: >-
-          {{
-            {
-              'path': (
-                virtualization_xen_disk_path ~ '/' ~ hostname ~ '.qcow2'
-                if ansible_loop.index0 == 0
-                else virtualization_xen_disk_path ~ '/' ~ hostname ~ '-disk' ~ ansible_loop.index0 ~ '.qcow2'
-              ),
-              'target': 'xvd' ~ device_letter,
-              'size': (item.size | float)
-            }
-          }}
-      loop: "{{ system_cfg.disks }}"
-      loop_control:
-        label: "{{ item | to_json }}"
-        extended: true
+      ansible.builtin.include_tasks: _xen_disks.yml
 
     - name: Create VM disks for Xen
       delegate_to: localhost