fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/astro/dist/cli/info/infra/cli-astro-config-resolver.d.ts

@@ -0,0 +1,10 @@
+import type { AstroConfig } from '../../../types/public/index.js';
+import type { Flags } from '../../flags.js';
+import type { AstroConfigResolver } from '../definitions.js';
+export declare class CliAstroConfigResolver implements AstroConfigResolver {
+    #private;
+    constructor({ flags }: {
+        flags: Flags;
+    });
+    resolve(): Promise<AstroConfig>;
+}