fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/astro/dist/assets/fonts/infra/xxhash-hasher.js

@@ -0,0 +1,18 @@
+import xxhash from "xxhash-wasm";
+import { sortObjectByKey } from "../utils.js";
+class XxhashHasher {
+  hashString;
+  constructor(hashString) {
+    this.hashString = hashString;
+  }
+  static async create() {
+    const { h64ToString } = await xxhash();
+    return new XxhashHasher(h64ToString);
+  }
+  hashObject(input) {
+    return this.hashString(JSON.stringify(sortObjectByKey(input)));
+  }
+}
+export {
+  XxhashHasher
+};