fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/astro/dist/vite-plugin-ssr-manifest/index.d.ts

@@ -0,0 +1,2 @@
+import type { Plugin as VitePlugin } from 'vite';
+export declare function vitePluginSSRManifest(): VitePlugin;

dealplustech-astro/node_modules/astro/dist/vite-plugin-ssr-manifest/index.js

@@ -0,0 +1,26 @@
+const manifestVirtualModuleId = "astro:ssr-manifest";
+const resolvedManifestVirtualModuleId = "\0" + manifestVirtualModuleId;
+function vitePluginSSRManifest() {
+  return {
+    name: "@astrojs/vite-plugin-astro-ssr-manifest",
+    enforce: "post",
+    resolveId(id) {
+      if (id === manifestVirtualModuleId) {
+        return resolvedManifestVirtualModuleId;
+      }
+    },
+    load(id) {
+      if (id === resolvedManifestVirtualModuleId) {
+        return {
+          code: `export let manifest = {};
+export function _privateSetManifestDontUseThis(ssrManifest) {
+  manifest = ssrManifest;
+}`
+        };
+      }
+    }
+  };
+}
+export {
+  vitePluginSSRManifest
+};