{pkgs, ...}: {
  # Install some packages.
  environment.systemPackages = with pkgs; [deploy-rs];

  # Allow emulating aarch64 to build for Raspberry Pi.
  boot.binfmt.emulatedSystems = ["aarch64-linux"];

  # Enable docker.
  flock.docker.enable = true;

  # Deploy NixOS updates once a week.
  systemd.timers."deploy-rs" = {
    wantedBy = ["timers.target"];
    timerConfig = {
      OnCalendar = "weekly";
      Persistent = true;
      Unit = "deploy-rs.service";
    };
  };

  systemd.services."deploy-rs" = {
    path = with pkgs; [openssh git nix deploy-rs];
    script = ''
      set -eu

      cd /home/fern/Repositories/flock
      git pull && nix flake update

      deploy && git commit -m "[ornithologist] Update flake.lock" && git push
    '';
    serviceConfig = {
      Type = "oneshot";
      User = "fern";
      Group = "users";
    };
  };
}