Fix supervisord.conf file path

otherwise image ignores the supplied supervisord.conf

php-worker/Dockerfile

@@ -19,7 +19,7 @@ MAINTAINER Mahmoud Zalt <mahmoud@zalt.me>
 # Modify the ./supervisor.conf file to match your App's requirements.
 # Make sure you rebuild your container with every change.
 #
-COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf
+COPY supervisord.conf /etc/supervisord.conf
 
 #
 #--------------------------------------------------------------------------