nginx(role): split up repo setup and install task lists to estab. conv.

Split up repo setup and package installation after all to establish this
as a convention (its already done this way in the docker role and was
done this way in the nginx role before) to highlight that an external
repo is used.

playbooks/maintenance.yaml

@@ -1,10 +1,15 @@
-- name: Ensure nginx install on nginx_hosts and nextcloud_hosts
+- name: Ensure NGINX repo setup and nginx install on nginx_hosts and nextcloud_hosts
   hosts: nginx_hosts:nextcloud_hosts
   tasks:
-    - name: Ensure NGINX is installed
+    - name: Ensure NGINX repo is setup
       ansible.builtin.include_role:
         name: nginx
-        tasks_from: main/02_nginx_install.yaml
+        tasks_from: main/02_repo_setup.yaml
+
+    - name: Ensure nginx is installed
+      ansible.builtin.include_role:
+        name: nginx
+        tasks_from: main/03_nginx_install.yaml
 
 - name: Make Sure System Package Are Up-To-Date for all non-hypervisors
   hosts: all:!hypervisors