actually use the log formatter

docker/nginx.conf

@@ -3,14 +3,14 @@ events {
 }
 
 http {
-  access_log /dev/stdout; # Log access to stdout
-  error_log /dev/stdout; # Log errors to stdout
-
   # Log format
   log_format main '[$time_local] "$request" '
                   '$status $body_bytes_sent "$http_referer" '
                   '"$http_user_agent" "$http_x_forwarded_for"';
 
+  access_log /dev/stdout main; # Log access to stdout
+  error_log /dev/stdout; # Log errors to stdout
+
   include       mime.types; # Include the mime types file
   default_type  application/octet-stream; # Default type