fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/astro/dist/env/sync.js

@@ -0,0 +1,33 @@
+import { ENV_TYPES_FILE } from "./constants.js";
+import { getEnvFieldType } from "./validators.js";
+function syncAstroEnv(settings) {
+  let client = "";
+  let server = "";
+  for (const [key, options] of Object.entries(settings.config.env.schema)) {
+    const str = `	export const ${key}: ${getEnvFieldType(options)};	
+`;
+    if (options.context === "client") {
+      client += str;
+    } else {
+      server += str;
+    }
+  }
+  let content = "";
+  if (client !== "") {
+    content = `declare module 'astro:env/client' {
+${client}}`;
+  }
+  if (server !== "") {
+    content += `declare module 'astro:env/server' {
+${server}}`;
+  }
+  if (content !== "") {
+    settings.injectedTypes.push({
+      filename: ENV_TYPES_FILE,
+      content
+    });
+  }
+}
+export {
+  syncAstroEnv
+};