Changed syntax on Volume declaration

Dockerfile

@@ -49,7 +49,7 @@ RUN sed -i 's/root \/home\/USER\/www\/html/root \/var\/www/g' /etc/nginx/conf.d/
 
 COPY /entrypoint.sh /
 
-VOLUME ["/var/www/user"]
+VOLUME /var/www/user
 
 EXPOSE 80
 CMD ["sh", "/entrypoint.sh"]