AETHER-2697 Separate task for adding apt repository for Nginx

Change-Id: I0b84cb091a4c2926119b0b520a9bc78c309ec5a0
diff --git a/tasks/main.yml b/tasks/main.yml
index b9d7f7b..14ed0a0 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -7,6 +7,10 @@
 - name: include OS-specific vars
   include_vars: "{{ ansible_os_family }}.yml"
 
+- name: include OS-specific package repo updates
+  include_tasks: "{{ ansible_os_family }}-repo.yml"
+  when: nginx_add_package_repo | bool
+
 - name: include OS-specific tasks
   include_tasks: "{{ ansible_os_family }}.yml"