{
  description = "Minimal NixOS Docker Swarm server";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
  };

  outputs = { self, nixpkgs, ... }@inputs: {
    nixosConfigurations.server = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      specialArgs = { inherit inputs; };
      modules = [
        ./configuration.nix
        {
          nix.settings.experimental-features = [ "nix-command" "flakes" ];
          nix.registry.nixpkgs.flake = nixpkgs;
          nix.nixPath = [ "nixpkgs=flake:nixpkgs" ];
        }
      ];
    };

    formatter.x86_64-linux = nixpkgs.legacyPackages.x86_64-linux.nixfmt-rfc-style;
  };
}