fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/node-fetch-native/lib/native.cjs

@@ -0,0 +1,11 @@
+const nodeFetch = require("../dist/native.cjs");
+
+function fetch(input, options) {
+  return nodeFetch.fetch(input, options);
+}
+
+for (const key in nodeFetch) {
+  fetch[key] = nodeFetch[key];
+}
+
+module.exports = fetch;