fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/ohash/dist/crypto/node/index.d.mts

@@ -0,0 +1,10 @@
+/**
+ * Hashes a string using the SHA-256 algorithm and encodes it in Base64URL format.
+ *
+ * @param {string} data - data message to hash.
+ *
+ * @returns {string} The hash of the data.
+ */
+declare function digest(data: string): string;
+
+export { digest };

dealplustech-astro/node_modules/ohash/dist/crypto/node/index.mjs

@@ -0,0 +1,5 @@
+import { createHash } from 'node:crypto';
+
+const e=globalThis.process?.getBuiltinModule?.("crypto")?.hash,r="sha256",s="base64url";function digest(t){if(e)return e(r,t,s);const o=createHash(r).update(t);return globalThis.process?.versions?.webcontainer?o.digest().toString(s):o.digest(s)}
+
+export { digest };