nginx: update to docker block

Adds commented out settings in nginx conf
for testing basic auth and auth proxy

docker/blocks/nginx_proxy/nginx.conf

@@ -13,7 +13,26 @@ http {
     listen 10080;
 
     location /grafana/ {
+      ################################################################
+      # Enable these settings to test with basic auth and an auth proxy header
+      # the htpasswd file contains an admin user with password admin and
+      # user1: grafana and user2: grafana
+      ################################################################
+
+      # auth_basic "Restricted Content";
+      # auth_basic_user_file /etc/nginx/htpasswd;
+
+      ################################################################
+      # To use the auth proxy header, set the following in custom.ini:
+      # [auth.proxy]
+      # enabled = true
+      # header_name = X-WEBAUTH-USER
+      # header_property = username
+      ################################################################
+
+      # proxy_set_header X-WEBAUTH-USER $remote_user;
+
       proxy_pass http://localhost:3000/;
     }
   }
-}
+}