improved test-nix example

modules/hosts/test-nix.nix

@@ -9,14 +9,33 @@ in
       imports = [
         inputs.self.homeModules."${username}"
       ];
+      home.sessionVariables = rec {
+        HOST = "${name}";
+        OTHER_VAR = "abc123";
+      };
     };
 
+    networking.hostName = "${name}";
+    # environment.sessionVariables = rec {
+    #   HOST = "${name}";
+    # };
+
     users.users."${username}" = {
       isNormalUser = true;
       shell = pkgs.zsh;
+      openssh.authorizedKeys.keys = [
+        "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIAUa4dcg1TWc4pW++uodyhX4eOqrX/QYIxFWtEP7HFJ john@john-pc-ubuntu"
+      ];
+    };
+    programs.zsh.enable = true;
+
+    services.openssh = {
+      enable = true;
+      # require public key authentication for better security
+      settings.PasswordAuthentication = false;
+      settings.KbdInteractiveAuthentication = false;
     };
 
-    programs.zsh.enable = true;
   };
 
   # Generic bootstrapping lxc, use a specific host file for more