https://github.com/marketplace/actions/install-nix
https://github.com/cachix/install-nix-action

samples
https://github.com/LGUG2Z/nixos-wsl-starter/blob/master/.github/workflows/build.yml
          - uses: cachix/install-nix-action@6a9a9e84a173d90b3ffb42c5ddaf9ea033fad011

2025
NixCon - Domen Kozar - What if GitHub Actions were local-first and built using Nix? 0:00 of 46:30
    https://www.youtube.com/watch?v=uOa6xazzj-s
    https://talks.nixcon.org/nixcon-2025/talk/S8SKEG/
    https://raw.githubusercontent.com/cachix/cloud.devenv.sh/refs/heads/main/docs/github-actions-nix.pdf
2022
https://danth.me/posts/post/update_your_nix_flake_using_github_actions.html
2021
https://gvolpe.com/blog/nixos-binary-cache-ci/
https://thewagner.net/blog/2020/12/06/deploying-with-github-actions-and-more-nix/