Fix upstream hostname

docker/Dockerfile.nginx

@@ -13,4 +13,4 @@ COPY ./nginx/tus.vhost.conf /etc/nginx/templates/default.conf.template
 
 # TODO: Make the resolver IP and instance hostname more variable!!
 RUN sed -i "s@resolver.*;@resolver 10.43.0.10 valid=30s;@g" /etc/nginx/templates/default.conf.template
-RUN sed -i 's@localhost@upload-server@g' /etc/nginx/templates/default.conf.template
+RUN sed -i 's@localhost@upload-server.vre.svc.cluster.local@g' /etc/nginx/templates/default.conf.template