Set up Redis images that can load themselves up from a NodeNorm backup

[gaurav]

The idea is that rather than a separate loading system, we could build all of that into one image with an init container (that downloads the Redis database) and then the main image (which runs off that Redis file). That way we don't have to load it at all -- we can put it in the right place and start Redis.

Described at helxplatform/translator-devops#1022