Add cluster host definitions, cluster utilities, and admin, switch nixpkgs to stable

hosts/cap-clust-01/configuration.nix

@@ -0,0 +1,41 @@
+# Edit this configuration file to define what should be installed on
+# your system.  Help is available in the configuration.nix(5) man page
+# and in the NixOS manual (accessible by running ‘nixos-help’).
+
+{ config, pkgs, ... }:
+
+{
+  imports = [
+    # Hardware Scan
+    ./hardware-configuration.nix
+
+    # Users
+    ../../users/cluster-admin/cluster-admin.nix
+
+
+    # System Configuration
+    ../../modules/system/cpu-amd.nix
+    ../../modules/system/fonts.nix
+    ../../modules/system/gpu-amd.nix
+    ../../modules/system/home-manager-settings.nix
+    ../../modules/system/internationalization.nix
+    ../../modules/system/networking.nix
+    ../../modules/system/nix-settings.nix
+    ../../modules/system/security.nix
+    ../../modules/system/systemd-boot.nix
+
+    # Application Groups
+    ../../modules/application-groups/system-utilities-cluster.nix
+  ];
+
+  networking.hostName = "cap-clust-01";
+  time.timeZone = "America/Los_Angeles";
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "25.11"; # Did you read the comment?
+}

hosts/cap-clust-01/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 + "/installer/scan/not-detected.nix")
+  ];
+
+  boot.initrd.availableKernelModules = [
+    "xhci_pci"
+    "ahci"
+    "ehci_pci"
+    "usb_storage"
+    "usbhid"
+    "sd_mod"
+  ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [
+    "kvm-amd"
+    "amdgpu"
+  ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" = {
+    device = "/dev/disk/by-uuid/0028a3af-8470-46c2-81ca-6d9be16a6236";
+    fsType = "ext4";
+  };
+
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-uuid/C389-7B6B";
+    fsType = "vfat";
+    options = [
+      "fmask=0077"
+      "dmask=0077"
+    ];
+  };
+
+  swapDevices = [
+    { device = "/dev/disk/by-uuid/2b063ac4-54ee-4b16-b766-9c470733995c"; }
+  ];
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}