Nix Build Caching Inside Docker Containers

Nix is a very useful tool for CI because it provides a portable and consistent build environment with accurate caching. I use it for almost all of my projects and have codified my setup in https://gitlab.com/kevincox/nix-ci/. This is a ready-to-go CI template for GitLab that uses Nix. While it supports binary caches (only Cachix at the moment), re-downloading all of the dependencies for each job can still take a minute or two. Not only is this a waste of time and resources but it also increased ...

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