Add a symlink /plugins for easy plugins install

Author: guilhem

Dockerfile

@@ -47,6 +47,8 @@ VOLUME /var/lib/rabbitmq
 # add a symlink to the .erlang.cookie in /root so we can "docker exec rabbitmqctl ..." without gosu
 RUN ln -sf /var/lib/rabbitmq/.erlang.cookie /root/
 
+RUN ln -sf /usr/lib/rabbitmq/lib/rabbitmq_server-$RABBITMQ_VERSION/plugins /plugins
+
 COPY docker-entrypoint.sh /
 ENTRYPOINT ["/docker-entrypoint.sh"]