fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/astro/dist/cli/info/infra/npm-package-manager.js

@@ -0,0 +1,32 @@
+class NpmPackageManager {
+  name = "npm";
+  #commandExecutor;
+  constructor({ commandExecutor }) {
+    this.#commandExecutor = commandExecutor;
+  }
+  async getPackageVersion(name) {
+    try {
+      const { stdout } = await this.#commandExecutor.execute(
+        "npm",
+        ["ls", name, "--json", "--depth=1"],
+        {
+          shell: true
+        }
+      );
+      const parsedNpmOutput = JSON.parse(stdout);
+      if (!parsedNpmOutput.dependencies) {
+        return void 0;
+      }
+      if (parsedNpmOutput.dependencies[name]) {
+        return `v${parsedNpmOutput.dependencies[name].version}`;
+      }
+      const astro = parsedNpmOutput.dependencies.astro;
+      return astro ? `v${astro.dependencies[name].version}` : void 0;
+    } catch {
+      return void 0;
+    }
+  }
+}
+export {
+  NpmPackageManager
+};