use list of dict for location.add_headers

defaults/main.yml

@@ -163,7 +163,10 @@ nginx_vhosts_default:
 #           - match: /
 #             root: /var/www/vhosts/default
 #             index: index.html
-#             add_headers: []
+#             add_headers:
+#               - name:
+#                 value:
+#                 always: True
 #             proxy_pass:
 #             proxy_http_version: "1.1"
 #             proxy_buffering: "off"

templates/etc/nginx/sites-available/vhost.j2

@@ -56,7 +56,7 @@ server {
         {% if location.add_headers is defined and location.add_headers %}
         include /etc/nginx/conf.d/header.conf;
         {% for add in location.add_headers %}
-        add_header {{ add }};
+        add_header {{ add.name }} {{ add.value }}{{ " always" if add.always | default(True) | bool else "" }};
         {% endfor %}
 
         {% endif %}