Allow Docker containers to access Kodi's webui.

So Nginx can proxy it with ssl.

roles/kodi/tasks/main.yml

@@ -118,3 +118,10 @@
     enabled: true
     name: '{{ item }}'
     state: started
+
+- name: Allow access to Kodi's webui from Docker containers
+  community.general.ufw:
+    from: 172.16.0.0/12
+    proto: tcp
+    rule: allow
+    to_port: !!str 9090