Add site-specific parameterization for nginx config

playbooks/group_vars/all

 ---
 app_base_dir: /opt/wwc
-# this path is relative to the playbook dir
-secure_dir: 'secure_example'
 venv_dir: /opt/edx
+
+# these pathes are relative to the playbook dir
+# directory for secret settings (keys, etc)
+secure_dir: 'secure_example'
+# this indicates the path to site-specific (with precedence)
+# things like nginx template files
+local_dir:  '../../ansible_local'
\ No newline at end of file

playbooks/roles/nginx/tasks/nginx_site.yml

@@ -2,7 +2,11 @@
 ---
 - name: Copying nginx config {{ site_name }}
   sudo: True
-  template: src={{ site_name }}.j2 dest=/etc/nginx/sites-available/{{ site_name }}
+  template: src={{ item }} dest=/etc/nginx/sites-available/{{ site_name }}
+  first_available_file:
+  - "{{ local_dir }}/nginx/templates/{{ site_name }}.j2"
+  # seems like paths in first_available_file must be relative to the playbooks dir
+  - "roles/nginx/templates/{{ site_name }}.j2" 
   notify: restart nginx
   tags:
   - nginx