https://flake.parts/
https://github.com/hercules-ci/flake-parts

https://community.flake.parts/
https://community.flake.parts/nixos-flake
https://github.com/srid/nixos-flake/blob/f6b7757ad88483afca306c9f3bf387887fba7284/flake-module.nix#L50-L100

samples
https://github.com/argoproj/argo-workflows/blob/master/dev/nix/flake.nix
https://zero-to-flakes.com/nixos-flake/
    https://github.com/srid/nixos-flake