update/format configuration for jack

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

server-modules/ssh.nix

@@ -1,16 +1,20 @@
-{ config, ... }: {
+# SSH configuration
+{config, ...}: let
+  username = config.var.username;
+in {
   services.openssh = {
     enable = true;
-    ports = [ 22 ];
+    ports = [22];
     openFirewall = true;
     settings = {
       PermitRootLogin = "no";
       PasswordAuthentication = false;
-      AllowUsers = [ config.var.username ];
+      AllowUsers = [username];
     };
   };
 
-  users.users."${config.var.username}" = {
+  # Add my public SSH key to my user
+  users.users."${username}" = {
     openssh.authorizedKeys.keys = [
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPG9SE80ZyBcXZK/f5ypSKudaM5Jo3XtQikCnGo0jI5E hadi@nixy"
     ];