fix: Add nixpacks configuration for Astro deployment

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

@@ -0,0 +1,33 @@
+function formatPnpmVersionOutput(versionOutput) {
+  return versionOutput.startsWith("link:") ? "Local" : `v${versionOutput}`;
+}
+class PnpmPackageManager {
+  name = "pnpm";
+  #commandExecutor;
+  constructor({ commandExecutor }) {
+    this.#commandExecutor = commandExecutor;
+  }
+  async getPackageVersion(name) {
+    try {
+      const { stdout } = await this.#commandExecutor.execute("pnpm", ["why", name, "--json"], {
+        shell: true
+      });
+      const parsedOutput = JSON.parse(stdout);
+      const deps = parsedOutput[0].dependencies;
+      if (parsedOutput.length === 0 || !deps) {
+        return void 0;
+      }
+      const userProvidedDependency = deps[name];
+      if (userProvidedDependency) {
+        return formatPnpmVersionOutput(userProvidedDependency.version);
+      }
+      const astroDependency = deps.astro?.dependencies[name];
+      return astroDependency ? formatPnpmVersionOutput(astroDependency.version) : void 0;
+    } catch {
+      return void 0;
+    }
+  }
+}
+export {
+  PnpmPackageManager
+};