created pxe-boot configuration

hosts/pxe-boot/configuration.nix

@@ -0,0 +1,81 @@
+{ config, lib, pkgs, inputs, ... }:
+
+let
+  pxeRoot = "/srv/pxe";
+  pxeBaseUrl = "http://pxe-boot";
+
+  menuIpxe = pkgs.writeText "menu.ipxe" ''
+    #!ipxe
+
+    set base ${pxeBaseUrl}
+
+    menu PXE Boot Menu
+    item nixos NixOS Installer
+    item rescue Rescue Environment
+    item shell iPXE Shell
+    item reboot Reboot
+
+    choose target && goto ''${target}
+
+    :nixos
+    kernel ''${base}/nixos/bzImage ip=dhcp
+    initrd ''${base}/nixos/initrd
+    boot
+
+    :rescue
+    kernel ''${base}/rescue/vmlinuz ip=dhcp
+    initrd ''${base}/rescue/initrd
+    boot
+
+    :shell
+    shell
+
+    :reboot
+    reboot
+  '';
+in
+{
+  imports =
+    [
+      ../../common/configuration.nix
+      ../../modules/nix/cache-client.nix
+      ../../modules/nix/remote-builder-client.nix
+    ];
+
+  networking.hostName = "pxe-boot";
+
+  environment.systemPackages = with pkgs; [
+    ipxe
+  ];
+
+  services.nginx = {
+    enable = true;
+
+    virtualHosts."pxe-boot" = {
+      default = true;
+      root = pxeRoot;
+      locations."/" = {
+        extraConfig = ''
+          autoindex on;
+        '';
+      };
+    };
+  };
+
+  systemd.tmpfiles.rules = [
+    "d ${pxeRoot} 0755 root root -"
+    "d ${pxeRoot}/boot 0755 root root -"
+    "d ${pxeRoot}/nixos 0755 root root -"
+    "d ${pxeRoot}/ubuntu 0755 root root -"
+    "d ${pxeRoot}/rescue 0755 root root -"
+    "C+ ${pxeRoot}/boot/menu.ipxe 0644 root root - ${menuIpxe}"
+    "C+ ${pxeRoot}/boot/ipxe.efi 0644 root root - ${pkgs.ipxe}/ipxe.efi"
+    "C+ ${pxeRoot}/boot/undionly.kpxe 0644 root root - ${pkgs.ipxe}/undionly.kpxe"
+  ];
+
+  services.openssh.settings.PermitRootLogin = "yes";
+
+  networking.firewall.allowedTCPPorts = [ 80 ];
+
+  system.stateVersion = "25.05";
+}