fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/astro/dist/vite-plugin-astro-server/index.js

@@ -0,0 +1,9 @@
+import { createController, runWithErrorHandling } from "./controller.js";
+import { default as default2 } from "./plugin.js";
+import { handleRequest } from "./request.js";
+export {
+  createController,
+  handleRequest,
+  runWithErrorHandling,
+  default2 as vitePluginAstroServer
+};