chore(nix): enhance Nginx proxy settings for Headscale

- Added extra HTTP headers and security configurations in the Nginx proxy for Headscale.
- Improves websocket handling, security headers, and HTTPS redirection.

systems/x86_64-linux/mx/headscale.nix

@@ -28,6 +28,18 @@ in
       locations."/" = {
         proxyPass = "http://localhost:${toString config.services.headscale.port}";
         proxyWebsockets = true;
+        extraConfig = ''
+          proxy_http_version 1.1;
+          proxy_set_header Upgrade $http_upgrade;
+          proxy_set_header Connection $connection_upgrade;
+          proxy_set_header Host $server_name;
+          proxy_redirect http:// https://;
+          proxy_buffering off;
+          proxy_set_header X-Real-IP $remote_addr;
+          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+          proxy_set_header X-Forwarded-Proto $scheme;
+          add_header Strict-Transport-Security "max-age=15552000; includeSubDomains" always;
+        '';
       };
     };
   };