Marcelo Frantz

This is a similar request to docker-library/postgres#404: VOLUMEs should not be declared [on the base image](https://github.com/docker-library/redis/blob/1e20bfbe22f999959f8997a823fa1ed5784fd8cc/4.0/alpine/Dockerfile#L57) (even if "not used" as is in redis). - It gives you unnamed volumes...