fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/css-tree/cjs/utils/create-custom-error.cjs

@@ -0,0 +1,18 @@
+'use strict';
+
+function createCustomError(name, message) {
+    // use Object.create(), because some VMs prevent setting line/column otherwise
+    // (iOS Safari 10 even throws an exception)
+    const error = Object.create(SyntaxError.prototype);
+    const errorStack = new Error();
+
+    return Object.assign(error, {
+        name,
+        message,
+        get stack() {
+            return (errorStack.stack || '').replace(/^(.+\n){1,3}/, `${name}: ${message}\n`);
+        }
+    });
+}
+
+exports.createCustomError = createCustomError;