Add host busch-gpu-docker

hosts/busch-gpu-docker/default.nix

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+{ inputs, outputs, config, lib, pkgs, pkgs-unstable, ... }:
+
+{
+  imports =
+    [
+      ../../modules/disko/legacy-full-ext4.nix
+      ./secrets.nix
+
+      ../../users/julius/nixos-server.nix
+      ../../modules/nix.nix
+      ../../modules/auto-upgrade.nix
+      ../../modules/locale.nix
+      ../../modules/server-cli.nix
+      ../../modules/sshd.nix
+      ../../modules/docker.nix
+      ../../modules/hawser.nix
+      ../../modules/netbird-client.nix
+      "${inputs.secrets}/modules/opkssh.nix"
+
+      # Include the results of the hardware scan.
+      ./hardware-configuration.nix
+    ];
+
+  # Use the GRUB 2 boot loader.
+  boot = {
+    loader.grub = {
+      enable = true;
+    };
+    tmp.useTmpfs = true;
+  };
+
+  hardware = {
+    graphics.enable = true;
+    nvidia = {
+      package = config.boot.kernelPackages.nvidiaPackages.legacy_470;
+      # TODO GTX 970 or GTX 960 driver 580 (>= 545)
+    };
+    nvidia-container-toolkit.enable = true;
+  };
+  nixpkgs.config.nvidia.acceptLicense = true;
+  services.xserver.videoDrivers = [ "nvidia" ];
+
+  networking.hostName = "docker-gpu"; # Define your hostname.
+
+  services.netbird-client = {
+    enable = true;
+    managementUrl = "https://netbird.jfreudenberger.de";
+    host.setupKey = "830217A8-BE0A-4919-A262-3CF7599487BA";
+    docker.setupKey = "C4C9FAE3-5FAE-4949-B8E8-BEDA3B954859";
+    dockerSubnet = "40";
+  };
+
+  services.hawser = {
+    enable = true;
+    dockhandServerUrl = "wss://dockhand-connect.jfreudenberger.de/api/hawser/connect";
+    tokenSecretFile = config.age.secrets.hawser-token;
+  };
+
+  # This option defines the first version of NixOS you have installed on this particular machine,
+  # and is used to maintain compatibility with application data (e.g. databases) created on older NixOS versions.
+  # Most users should NEVER change this value after the initial install, for any reason,
+  # even if you've upgraded your system to a new NixOS release.
+  # This value does NOT affect the Nixpkgs version your packages and OS are pulled from,
+  # so changing it will NOT upgrade your system - see https://nixos.org/manual/nixos/stable/#sec-upgrading for how
+  # to actually do that.
+  # This value being lower than the current NixOS release does NOT mean your system is
+  # out of date, out of support, or vulnerable.
+  # Do NOT change this value unless you have manually inspected all the changes it would make to your configuration,
+  # and migrated your data accordingly.
+  # For more information, see `man configuration.nix` or https://nixos.org/manual/nixos/stable/options#opt-system.stateVersion .
+  system.stateVersion = "25.05"; # Did you read the comment?
+}

hosts/busch-gpu-docker/hardware-configuration.nix

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+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/profiles/qemu-guest.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "ata_piix" "uhci_hcd" "ehci_pci" "ahci" "virtio_pci" "virtio_scsi" "sd_mod" "sr_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.extraModulePackages = [ ];
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+}

hosts/busch-gpu-docker/secrets.nix

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+{ inputs, ... }:
+{
+  age.secrets = {
+    hawser-token.file = "${inputs.secrets}/secrets/busch-gpu-docker/hawser-token";
+  };
+}