fix: Add nixpacks configuration for Astro deployment

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

@@ -0,0 +1,7 @@
+import type { Hasher } from '../definitions.js';
+export declare class XxhashHasher implements Hasher {
+    hashString: (input: string) => string;
+    private constructor();
+    static create(): Promise<XxhashHasher>;
+    hashObject(input: Record<string, any>): string;
+}