add nix playbook for updating kodi configs

plays/nix.yml

@@ -0,0 +1,11 @@
+---
+# This playbook works best when run with "--tags nix"
+- hosts: kodi
+  gather_facts: true
+  remote_user: root
+  become: true
+  pre_tasks:
+    - ansible.builtin.include_vars: ../vars/vault.yaml
+    - ansible.builtin.include_vars: ../group_vars/kodi.yml
+  roles:
+    - kodi-config