hosts/astatine: add guest user

hosts/astatine/configuration.nix

@@ -4,6 +4,8 @@
   imports =
     [
       ./hardware-configuration.nix
+
+      ./isa.nix
     ];
 
   boot.kernelParams = [ "console=ttyS0,115200n8" ];

hosts/astatine/isa.nix

@@ -0,0 +1,11 @@
+{ ... }:
+
+{
+  users.users.isa = {
+    isNormalUser = true;
+    extraGroups = [ "guests" ];
+    openssh.authorizedKeys.keys = [
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGrvhqC/tZzpLMs/qy+1xNSVi2mfn8LXPIEhh7dcGn9e"
+    ];
+  };
+}