Add config for busch

Busch is the proxmox host used for various vms, which will be defined
through terraform or similar.

hosts/busch/default.nix

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+{ inputs, outputs, config, lib, pkgs, ... }:
+
+{
+  imports =
+    [
+      ./disko.nix
+
+      ../../modules/nix.nix
+      ../../modules/auto-upgrade.nix
+      ../../modules/locale.nix
+      ../../modules/server-cli.nix
+      ../../modules/sshd.nix
+      ${inputs.secrets}/modules/opkssh.nix
+
+      ../../modules/intel-cpu.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;
+  };
+  networking.hostName = "busch"; # Define your hostname.
+  users = {
+    users = {
+      julius = {
+        isNormalUser = true;
+        uid = 1000;
+        extraGroups = [ "wheel" "julius" ];
+      };
+    };
+    groups = {
+      julius = {
+        gid = 1000;
+      };
+    };
+  };
+
+  nix.settings = {
+    substituters = [
+      "https://cache.saumon.network/proxmox-nixos"
+    ];
+    trusted-public-keys = [
+      "proxmox-nixos:D9RYSWpQQC/msZUWphOY2I5RLH5Dd6yQcaHIuug7dWM="
+    ];
+  };
+
+  services = {
+    proxmox-ve = {
+      enable = true;
+      ipAddress = "192.168.7.252";
+
+      # Make vmbr0 bridge visible in Proxmox web interface
+      bridges = [ "vmbr0" ];
+    };
+    openiscsi = {
+      enable = true;
+      name = "busch";
+    };
+  };
+
+  networking.useDHCP = false;
+
+  systemd.network = {
+    enable = true;
+
+    networks."10-lan" = {
+      matchConfig.Name = [ "enp0s25" ];
+      networkConfig = {
+        Bridge = "vmbr0";
+      };
+    };
+
+    netdevs."vmbr0" = {
+      netdevConfig = {
+        Name = "vmbr0";
+        Kind = "bridge";
+      };
+    };
+
+    networks."10-lan-bridge" = {
+      matchConfig.Name = "vmbr0";
+      networkConfig = {
+        IPv6AcceptRA = true;
+        DHCP = "ipv4";
+      };
+      linkConfig.RequiredForOnline = "routable";
+    };
+  };
+
+  # 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/disko.nix

@@ -0,0 +1,107 @@
+{
+  disko.devices = {
+    disk = {
+      disk1 = {
+        type = "disk";
+        device = "/dev/disk/by-id/ata-Samsung_SSD_850_PRO_256GB_S251NX0H423575T";
+        content = {
+          type = "gpt";
+          partitions = {
+            MBR = {
+              type = "EF02"; # for grub MBR
+              size = "1M";
+              priority = 1; # Needs to be first partition
+            };
+            ESP = {
+              priority = 1;
+              name = "ESP";
+              size = "2G";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+                mountOptions = [ "umask=0077" ];
+              };
+            };
+            crypt_p1 = {
+              size = "100%";
+              content = {
+                type = "luks";
+                name = "p1";
+                settings = {
+                  allowDiscards = true;
+                };
+              };
+            };
+          };
+        };
+      };
+      disk2 = {
+        type = "disk";
+        device = "/dev/disk/by-id/ata-Samsung_SSD_850_PRO_256GB_S251NXAG833792N";
+        content = {
+          type = "gpt";
+          partitions = {
+            MBR = {
+              type = "EF02"; # for grub MBR
+              size = "1M";
+              priority = 1; # Needs to be first partition
+            };
+            ESP = {
+              priority = 1;
+              name = "ESP";
+              size = "2G";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot-fallback";
+                mountOptions = [ "umask=0077" ];
+              };
+            };
+            crypt_p2 = {
+              size = "100%";
+              content = {
+                type = "luks";
+                name = "p2";
+                settings = {
+                  allowDiscards = true;
+                };
+                content = {
+                  type = "btrfs";
+                  extraArgs = [
+                    "-d raid1"
+                    "-m raid1"
+                    "/dev/mapper/p1"
+                  ];
+                  subvolumes = {
+                    "/rootfs" = {
+                      mountpoint = "/";
+                    };
+                    "/home" = {
+                      mountOptions = [ "compress=zstd" ];
+                      mountpoint = "/home";
+                    };
+                    "/nix" = {
+                      mountOptions = [ "compress=zstd" "noatime" ];
+                      mountpoint = "/nix";
+                    };
+                    "/pve-cluster" = {
+                      mountOptions = [ "compress=zstd" ];
+                      mountpoint = "/var/lib/pve-cluster";
+                    };
+                    "/swap" = {
+                      mountpoint = "/.swapvol";
+                      swap.swapfile.size = "32G";
+                    };
+                  };
+                };
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}

hosts/busch/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 = [ "ahci" "xhci_pci" "ehci_pci" "mpt3sas" "usbhid" "usb_storage" "sr_mod" ];
+  boot.initrd.kernelModules = [ "vfio_pci" "vfio" "vfio_iommu_type1" ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.extraModulePackages = [ ];
+  boot.kernelParams = [ "intel_iommu=on" "iommu=pt" "vfio-pci.ids=1000:0087" ];
+
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp1s0.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}