fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/package-manager-detector/dist/detect.d.mts

@@ -0,0 +1,16 @@
+import { d as DetectOptions, e as DetectResult, a as AgentName } from './shared/package-manager-detector.DksAilYA.mjs';
+
+/**
+ * Detects the package manager used in the running process.
+ *
+ * This method will check for `process.env.npm_config_user_agent`.
+ */
+declare function getUserAgent(): AgentName | null;
+/**
+ * Detects the package manager used in the project.
+ * @param options {DetectOptions} The options to use when detecting the package manager.
+ * @returns {Promise<DetectResult | null>} The detected package manager or `null` if not found.
+ */
+declare function detect(options?: DetectOptions): Promise<DetectResult | null>;
+
+export { detect, getUserAgent };