role nginx: add options for proxy directive and additional root location configuration

roles/nginx/templates/service.conf

@@ -12,7 +12,9 @@
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_set_header X-Forwarded-Proto $scheme;
         proxy_set_header X-Frame-Options SAMEORIGIN;
-        proxy_pass {{ remote_host | default("http://127.0.0.1:8080") }};
+        {{ proxy_type | default("proxy_pass") }} {{ remote_host | default("http://127.0.0.1:8080") }};
+        {% block root %}
+        {% endblock %}
     }
 {% endblock %}