Combine file creation with chown/chmod RUN

Dockerfile

@@ -59,12 +59,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 # /usr/sbin/rabbitmq-server has some irritating behavior, and only exists to "su - rabbitmq /usr/lib/rabbitmq/bin/rabbitmq-server ..."
 ENV PATH /usr/lib/rabbitmq/bin:$PATH
 
-RUN echo '[ { rabbit, [ { loopback_users, [ ] } ] } ].' > /etc/rabbitmq/rabbitmq.config
-
 # set home so that any `--user` knows where to put the erlang cookie
 ENV HOME /var/lib/rabbitmq
 
 RUN mkdir -p /var/lib/rabbitmq /etc/rabbitmq \
+	&& echo '[ { rabbit, [ { loopback_users, [ ] } ] } ].' > /etc/rabbitmq/rabbitmq.config \
 	&& chown -R rabbitmq:rabbitmq /var/lib/rabbitmq /etc/rabbitmq \
 	&& chmod -R 777 /var/lib/rabbitmq /etc/rabbitmq
 VOLUME /var/lib/rabbitmq