build: add lint and unit tests to ci

Add building, linting, and unit testing to a new GitHub action workflow.

.github/workflows/ci.yml

@@ -0,0 +1,23 @@
+name: Node.js CI
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+
+jobs:
+  unit-tests:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          cache: "npm"
+      - run: npm ci
+      - run: npm run lint
+      - run: npm run build
+      - run: npm run test:ci

package.json

@@ -12,6 +12,7 @@
     "prepare": "husky install",
     "start": "next start",
     "test": "jest --watch",
+    "test:ci": "jest --ci",
     "test:e2e": "playwright test"
   },
   "lint-staged": {