Consolidate interface setup for debian and proxmox roles

roles/proxmox/tasks/main.yml

@@ -13,6 +13,13 @@
   apt_repository:
     repo: 'deb http://download.proxmox.com/debian/pve {{ ansible_distribution_release }} pve-no-subscription'
 
+- name: Set up loopback interface
+  template:
+    dest: /etc/network/interfaces.d/loopback.intf
+    src: loopback.intf.j2
+    mode: 0644
+  notify: reload interfaces
+
 - include_tasks: mgmt.yml
 
 - include_tasks: sdn.yml