Also ensure NGINX repo and install before apt update for nextcloud_hosts

Do that because the nextcloud role uses NGINX via the nginx role
internally as well, but nextcloud_hosts aren't necessarily in the
nginx_hosts group then.

playbooks/maintenance.yaml

@@ -11,6 +11,21 @@
         name: nginx
         tasks_from: main/nginx_install
 
+- name: Ensure NGINX repo and install on nextcloud_hosts
+  hosts: nextcloud_hosts:!nginx_hosts
+  tasks:
+    - name: make sure NGINX repos are setup
+      ansible.builtin.include_role:
+        name: nginx
+        tasks_from: main/repo_setup
+
+    - name: make sure NGINX is installed
+      ansible.builtin.include_role:
+        name: nginx
+        tasks_from: main/nginx_install
+      vars:
+        nginx__version_spec: "{{ nextcloud__nginx_version_spec | default('') }}"
+
 - name: Make Sure System Package Are Up-To-Date
   hosts: all
   roles: