fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/astro/dist/cli/install-package.d.ts

@@ -0,0 +1,10 @@
+import type { Logger } from '../core/logger/core.js';
+type GetPackageOptions = {
+    skipAsk?: boolean;
+    optional?: boolean;
+    cwd?: string;
+};
+export declare function getPackage<T>(packageName: string, logger: Logger, options: GetPackageOptions, otherDeps?: string[]): Promise<T | undefined>;
+export declare function fetchPackageJson(scope: string | undefined, name: string, tag: string): Promise<Record<string, any> | Error>;
+export declare function fetchPackageVersions(packageName: string): Promise<string[] | Error>;
+export {};