{
  perSystem =
    { pkgs, ... }:
    {
      checks = {
        statix =
          pkgs.runCommand "statix-check"
            {
              nativeBuildInputs = [
                # For experimental pipe-operators support.
                (pkgs.statix.overrideAttrs rec {
                  src = pkgs.fetchFromGitHub {
                    owner = "oppiliappan";
                    repo = "statix";
                    rev = "43681f0da4bf1cc6ecd487ef0a5c6ad72e3397c7";
                    hash = "sha256-LXvbkO/H+xscQsyHIo/QbNPw2EKqheuNjphdLfIZUv4=";
                  };
                  cargoDeps = pkgs.rustPlatform.importCargoLock {
                    lockFile = src + "/Cargo.lock";
                    allowBuiltinFetchGit = true;
                  };
                })
              ];
            }
            ''
              statix check ${../.}
              touch $out
            '';
        deadnix =
          pkgs.runCommand "deadnix-check"
            {
              nativeBuildInputs = [ pkgs.deadnix ];
            }
            ''
              deadnix --fail ${../.}
              touch $out
            '';
        # Don't use legacy imports.
        nix-path =
          pkgs.runCommand "nix-path"
            {
              # nativeBuildInputs = [ pkgs.grep ];
            }
            ''
              ! grep -r "import <nixpkgs>" ${../.}/modules/ --exclude=checks.nix || exit 1
              ! grep -r "import <nixos>" ${../.}/modules/ --exclude=checks.nix || exit 1
              touch $out
            '';
      };
    };
}

      schedule = [
        # See `./update-flake-inputs.nix` for more details.
        { cron = "0 0 * * *"; } # Every day at 00:05. Keep ahead of `./update-flake-inputs.yml`.
      ];

      # schedule = [
      #   # See `./update-flake-inputs.nix` for more details.
      #   { cron = "0 0 * * *"; } # Every day at 00:05. Keep ahead of `./update-flake-inputs.yml`.
      # ];

  job = name: target: runs-on: {

  buildJob = name: target: runs-on: {
    inherit name runs-on;
    steps = stepsWithCheckout [
      {
        inherit name;
        run = # bash
          ''
            nix build .#${target}.config.system.build.toplevel --accept-flake-config --builders "" --no-link
          '';
      }
    ];
  };
  checkJob = name: target: {

    inherit runs-on;

    runs-on = "plum";

            nix build .#${target}.config.system.build.toplevel --accept-flake-config --builders "" --no-link

            nix build .#checks.x86_64-linux.${target} --accept-flake-config --builders "" --no-link

        branches = [ "**" ];

        branches = [ "dendritic" ];

      build-date = job "Build: date" "nixosConfigurations.date" "plum";
      build-kiwi = job "Build: kiwi" "nixosConfigurations.kiwi" "kiwi";

      build-date = buildJob "Build: date" "nixosConfigurations.date" "plum";
      build-kiwi = buildJob "Build: kiwi" "nixosConfigurations.kiwi" "kiwi";

      build-pear = job "Build: pear" "nixosConfigurations.pear" "plum";
      build-plum = job "Build: plum" "nixosConfigurations.plum" "plum";
      build-yuzu = job "Build: yuzu" "nixosConfigurations.yuzu" "plum";

      build-pear = buildJob "Build: pear" "nixosConfigurations.pear" "plum";
      build-plum = buildJob "Build: plum" "nixosConfigurations.plum" "plum";
      build-yuzu = buildJob "Build: yuzu" "nixosConfigurations.yuzu" "plum";
      build-blackwell = buildJob "Build: blackwell" "nixosConfigurations.blackwell" "blackwell";
      check-deadnix = checkJob "Check: deadnix" "deadnix";
      check-statix = checkJob "Check: statix" "statix";
      check-nix-paths = checkJob "Check: legacy imports" "nix-path";

      build-blackwell = job "Build: blackwell" "nixosConfigurations.blackwell" "blackwell";

  schedule:
  - cron: 0 0 * * *

  check-deadnix:
    name: 'Check: deadnix'
    runs-on: plum
    steps:
    - name: Checkout
      uses: actions/checkout@v5
    - name: 'Check: deadnix'
      run: nix build .#checks.x86_64-linux.deadnix --accept-flake-config --builders
        "" --no-link
  check-nix-paths:
    name: 'Check: legacy imports'
    runs-on: plum
    steps:
    - name: Checkout
      uses: actions/checkout@v5
    - name: 'Check: legacy imports'
      run: nix build .#checks.x86_64-linux.nix-path --accept-flake-config --builders
        "" --no-link
  check-statix:
    name: 'Check: statix'
    runs-on: plum
    steps:
    - name: Checkout
      uses: actions/checkout@v5
    - name: 'Check: statix'
      run: nix build .#checks.x86_64-linux.statix --accept-flake-config --builders
        "" --no-link

    - '**'

    - dendritic