feat(pm/umber): init

Umber is a system that'll be replacing firebrick in the long term. I
need to transfer over the private silverbullet and set up backups on
here for it to fulfil that role...

packetmix/systems/default.nix

···
       project = config;
     };
   };
+  config.systems.nixos."umber" = {
+    pkgs = nixpkgs.x86_64-linux;
+    ingredients = [
+      "freshlybakedcake"
+      "server"
+    ];
+    args = {
+      system = "x86_64-linux";
+      project = config;
+    };
+  };
 }

packetmix/systems/umber/hardware-configuration.nix

···
+# SPDX-FileCopyrightText: 2025 FreshlyBakedCake
+#
+# SPDX-License-Identifier: MIT
+
+{
+  boot.initrd.availableKernelModules = [
+    "nvme"
+    "xhci_pci"
+    "ahci"
+    "usbhid"
+    "uas"
+    "usb_storage"
+    "sd_mod"
+  ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-amd" ];
+  boot.extraModulePackages = [ ];
+  fileSystems."/nix" = {
+    device = "/dev/disk/by-uuid/2b18af0a-1c4f-4195-8f3f-18a1cc987985";
+    fsType = "btrfs";
+    options = [ "subvol=@nix" ];
+  };
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-uuid/D50D-92FC";
+    fsType = "vfat";
+    options = [
+      "fmask=0022"
+      "dmask=0022"
+    ];
+  };
+
+  clicks.storage.impermanence = {
+    enable = true;
+    devices = {
+      root = "/dev/disk/by-uuid/2b18af0a-1c4f-4195-8f3f-18a1cc987985";
+      persist = "/dev/disk/by-uuid/44311fe0-01b9-477b-9626-bf3879bda1da";
+    };
+  };
+}

packetmix/systems/umber/hostname.nix

···
+# SPDX-FileCopyrightText: 2025 FreshlyBakedCake
+#
+# SPDX-License-Identifier: MIT
+
+{ networking.hostName = "umber"; }

packetmix/systems/umber/secrets.nix

···
+# SPDX-FileCopyrightText: 2025 FreshlyBakedCake
+#
+# SPDX-License-Identifier: MIT
+
+{
+  clicks.storage.impermanence.persist.directories = [ "/secrets" ];
+}