feat: add iso

Signed-off-by: gwg313 <gwg313@pm.me>

hosts/iso/configuration.nix

@@ -0,0 +1,37 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+{
+  networking.hostName = "nixos-iso";
+
+  # Required dummy boot device for ISO builds
+  boot.loader.grub.device = "/dev/sda";
+
+  # Enable OpenSSH at boot
+  services.openssh.enable = true;
+
+  # Permit root login via SSH key (disable password auth)
+  services.openssh.settings = {
+    PermitRootLogin = "prohibit-password";
+    PasswordAuthentication = false;
+  };
+
+  users.users.root = {
+    initialHashedPassword = lib.mkForce "!"; # disables password login
+    openssh.authorizedKeys.keys = [
+      # Replace with your actual SSH public key
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINvOfDSjlvegGqfUS18XwXB7SvS2n9/hGYUpKxRb9vgb gwg313@pm.me"
+    ];
+  };
+
+  # Useful base tools
+  environment.systemPackages = with pkgs; [
+    git
+    htop
+    vim
+    curl
+  ];
+}