{ config, ... }: {
  nix.buildMachines = [
    {
      hostName = "localhost";
      sshUser = "hydra-queue-runner";
      maxJobs = 20;
      speedFactor = 17;
      systems = [ "x86_64-linux" ];
      supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
      sshKey = config.sops.secrets."services/hydra/id_ed25519_hydra".path;
    }
    {
      hostName = "integra.kyouma.net";
      sshUser = "build";
      maxJobs = 2;
      speedFactor = 4;
      systems = [ "aarch64-linux" ];
      supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
      sshKey = config.sops.secrets."services/hydra/id_ed25519_hydra".path;
    }
    {
      hostName = "build-worker-03.nyantec.com";
      sshUser = "nix-ssh";
      maxJobs = 8;
      speedFactor = 18;
      systems = [ "x86_64-linux" "riscv64-linux" ];
      supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" "gccarch-x86-64" "gccarch-x86-64-v2" "gccarch-x86-64-v3" ];
      sshKey = config.sops.secrets."services/hydra/id_ed25519_hydra".path;
    }
    {
      hostName = "build-worker-04.nyantec.com";
      sshUser = "nix-ssh";
      maxJobs = 8;
      speedFactor = 18;
      systems = [ "x86_64-linux" "riscv64-linux" ];
      supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" "gccarch-x86-64" "gccarch-x86-64-v2" "gccarch-x86-64-v3" ];
      sshKey = config.sops.secrets."services/hydra/id_ed25519_hydra".path;
    }
  ];
  nix.settings = {
    allowed-uris = [
      "github:"
      "git+https://"
      "git+ssh://"
      "https://"
    ];
  };
  users.users.hydra-queue-runner.openssh.authorizedKeys.keys = [
      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE/vCXM3IaxJP9v2Y+xcQrQD2IcffgdzqtWhpMjj9Xl5 hydra@seras"
  ];
  programs.ssh = {
    knownHosts."build-worker-03.nyantec.com".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEGqTY74c5g15DSNPNM2Wdr5jAwS7BFgX1XRnhtGOnJc";
    knownHosts."build-worker-04.nyantec.com".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICOq+5I+nlAN2lJoOtoXrYEDuZ/TMPMa43pIlablYigK";
    knownHosts."integra.kyouma.net".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIBwEQiSfaDrUAwgul4mktusBPcIVxI4pLNDh9DPopVU";
    knownHosts."localhost".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPNVavo3YHVsrYwXRVISu7kDoknn+5inFGySn4azlB8P";
  };
}