fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/crossws/dist/adapters/deno.d.mts

@@ -0,0 +1,19 @@
+import { Adapter, AdapterInstance, AdapterOptions } from '../index.mjs';
+import '../shared/crossws.BQXMA5bH.mjs';
+
+interface DenoAdapter extends AdapterInstance {
+    handleUpgrade(req: Request, info: ServeHandlerInfo): Promise<Response>;
+}
+interface DenoOptions extends AdapterOptions {
+}
+type ServeHandlerInfo = {
+    remoteAddr?: {
+        transport: string;
+        hostname: string;
+        port: number;
+    };
+};
+declare const denoAdapter: Adapter<DenoAdapter, DenoOptions>;
+
+export { denoAdapter as default };
+export type { DenoAdapter, DenoOptions };