https://cachix.org/
https://docs.cachix.org/pushing
https://docs.cachix.org/installation
https://docs.cachix.org/faq
https://github.com/cachix/cachix
https://app.cachix.org/
https://docs.cachix.org/getting-started
https://app.cachix.org/cache/nixpkgs-wayland
https://github.com/colemickens/nixpkgs-wayland
    nix profile install github:cachix/cachix/latest
    https://blog.cachix.org/posts/2020-11-09-write-access-control-for-binary-caches/
        CACHIX_AUTH_TOKEN or via configuration file by running cachix authtoken.

2024
https://blog.cachix.org/posts/2024-01-12-cachix-v1-7/
2020
https://fzakaria.com/2020/08/11/caching-your-nix-shell.html