Explicitly set the permissions for the supervisor config for celery.

playbooks/roles/notifier/tasks/main.yml

@@ -127,6 +127,7 @@
   template:
     src: "{{ item.src }}"
     dest: "{{ item.dest }}"
+    mode: "0644"
   become_user: "{{ supervisor_user }}"
   with_items:
     - { src: 'edx/app/supervisor/conf.d/notifier-celery-workers.conf.j2', dest: '{{ supervisor_available_dir }}/notifier-celery-workers.conf' }