Use fastcgi include for Nginx development container

nginx/dev/Dockerfile

@@ -1,3 +1,3 @@
 FROM skpr/nginx:1.x
 
-ADD default.conf /etc/nginx/conf.d/default.conf
+ADD fastcgi_dev.conf /etc/nginx/overrides.d/fastcgi/dev.conf

nginx/dev/fastcgi_dev.conf

@@ -0,0 +1,10 @@
+fastcgi_pass localhost:9000;
+
+# Route to a separate container with xdebug enabled.
+if ($cookie_XDEBUG_SESSION){
+  fastcgi_pass localhost:9001;
+}
+
+# Bump the buffer size to accomodate large headers on local environments.
+fastcgi_buffers 16 16k;
+fastcgi_buffer_size 16k;