Update Dockerfile

nodered/Dockerfile

@@ -56,7 +56,7 @@ RUN chown -R node-red:node-red /usr/src/node-red && \
 RUN set -ex \
 	&& apt-get install -y wget sudo net-tools dhcpdump  bluez arp-scan
 
-RUN addgroup sudo && addgroup node-red sudo
+RUN addgroup node-red sudo
 
 RUN cat /dev/null > /etc/sudoers \
 	&& echo -e "Set disable_coredump false\n" > /etc/sudo.conf \