Cheap Docker images with Nix

This article discusses how to use the Nix language and deployment tool to create smaller Docker images for Redis with better caching capabilities. The author explains how to build a Redis image using Nix expressions instead of traditional Dockerfiles, resulting in significantly smaller image sizes (around 42mb or even 25mb compared to the default 177mb). The article also provides information on building images with different versions of Redis and creating a generic function for building Redis images. Finally, it touches upon reusing existing Docker images as base images while using Nix expressions.