add dockerhub image

docker/nginx.conf

@@ -5,7 +5,7 @@ events {
 http {
   access_log /dev/stdout;
   error_log /dev/stdout;
-  
+
   include       mime.types;
   default_type  application/octet-stream;
 
@@ -22,7 +22,7 @@ http {
     root /var/www/html;
     index index.html index.htm;
 
-    client_max_body_size 500M;
+    client_max_body_size 500M; # Will get replaced by the environment variable MAX_UPLOAD_SIZE
 
     location ~ \.php$ {
       try_files $uri =404;