inserted 'fqdn' variable so use of inventory hostname as a fully qualified domain name for managed node or target host services could be overridden

vars/certbot_settings@homeserver.yml

@@ -5,6 +5,6 @@ certbot:
   port: ~
   email: ajt95@prole.biz
   domains:
-    - "{{ inventory_hostname }}"
-    - "*.{{ inventory_hostname }}"
+    - "{{ fqdn | default(inventory_hostname) }}"
+    - "*.{{ fqdn | default(inventory_hostname) }}"
   cron: "2 6 24 1 *"

vars/certbot_settings@vps.yml

@@ -5,6 +5,6 @@ certbot:
   port: 53
   email: ajt95@prole.biz
   domains:
-    - "{{ inventory_hostname }}"
-    - "*.{{ inventory_hostname }}"
+    - "{{ fqdn | default(inventory_hostname) }}"
+    - "*.{{ fqdn | default(inventory_hostname) }}"
   cron: ~