Add Nginx configuration file

In order to mimic the Rails container using Django, I installed a Nginx
reverse proxy that communicate directly with the Django application
(through Gunicorn or directly).

The current configuration is a copy of the Rails configuration except
the listening port.
Signed-off-by: Matthieu Berjon <matthieu.berjon@inria.fr>

django/setup/dk/nginx.conf

+upstream allgo
+{
+	server 127.0.0.1:4000  fail_timeout=0;
+#  server unix:/run/rails.sock fail_timeout=0;
+}
+
+server
+{
+  listen		8080;
+
+  client_max_body_size 1G;
+  client_body_in_file_only clean;
+  client_body_buffer_size 32K;
+
+  sendfile on;
+  send_timeout 300s;
+
+  keepalive_timeout 5;
+  root /opt/allgo/public/;
+  try_files $uri/index.html $uri.html $uri @allgo;
+
+  location @allgo
+  {
+    # the 'Host' header must be forwarded as-is because turbolinks needs it to
+    # work properly
+    proxy_set_header Host $http_host;
+    # however we do not forward 'X-Forwarded-Proto' because this would
+    # overwrite the value set by dev-nginx
+    # proxy_set_header X-Forwarded-Proto $scheme;
+
+    proxy_redirect off;
+    proxy_pass http://allgo;
+  }
+}