Results 2 issues of Ciro9527

移除rack,curb运行时依赖 responce改名为response 添加Gemfile 测试改用minitest,官方自带的unit test的assert_raise_message方法在2.1.1已改名

## Issue summary https://shopify.dev/docs/apps/build/discounts/discount-function-examples/order-minimum-subtotal https://github.com/Shopify/function-examples/tree/order-discount-example/sample-apps/discounts/extensions The Order Discount sample code is automatically upgraded to discount-app-components to 3.0, and an error is reported ```text 10:14:45 │ remix │ app/routes/app.minimum-subtotal.$functionId.$id.jsx:29:149: 10:14:45 │...

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