add gitlab-ci and remove unused test and update .gitignore

.gitignore

@@ -10,6 +10,7 @@
 
 # production
 /build
+/builds
 
 # misc
 .DS_Store

.gitlab-ci.yml

+stages:
+  - build
+  - test
+  - deploy
+
+variables:
+  GIT_DEPTH: "1"
+
+npm_build:
+  stage: build
+  tags:
+    - linux
+  script:
+    - npm ci
+    - npm run build
+
+# npm_test:
+#   stage: test
+#   tags:
+#     - linux
+#   script: npm run test
+#   dependencies:
+#     - npm_build

src/App.test.tsx

-import React from "react";
-import { render, screen } from "@testing-library/react";
-import App from "./App";
-
-test("renders learn react link", () => {
-  render(<App />);
-  const linkElement = screen.getByText(/learn react/i);
-  expect(linkElement).toBeInTheDocument();
-});