feat: Add support for ipxe boot ephemeral systems

sw/stateless-kiosk/net.nix

@@ -0,0 +1,43 @@
+{ config, lib, pkgs, inputs, ... }:
+{
+  # Minimal container networking (systemd-networkd)
+  networking = {
+    useNetworkd = true;
+    networkmanager.enable = false;
+    dhcpcd.enable = false;
+    useDHCP = false;
+    useHostResolvConf = false;
+  };
+
+  systemd.network = {
+    enable = true;
+    wait-online.enable = true;
+
+    networks."10-wired" = {
+      matchConfig.Type = "ether";
+      networkConfig = {
+        LinkLocalAddressing = false;
+        DHCP = "no";
+        VLAN = [ "vlan5" ];
+      };
+      linkConfig.RequiredForOnline = "no";
+    };
+
+    netdevs."20-vlan5" = {
+      netdevConfig = {
+        Kind = "vlan";
+	Name = "vlan5";
+      };
+      vlanConfig.Id = 5;
+    };
+
+    networks."30-vlan5" = {
+      matchConfig.Name = "vlan5";
+      networkConfig = {
+        DHCP = "ipv4";
+        IPv6AcceptRA = true;
+      };
+      linkConfig.RequiredForOnline = "routable";
+    };
+  };
+}