Add CI workflow

.github/workflows/ci.yml

@@ -0,0 +1,24 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - '**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '20.x'
+      - run: npm ci
+      - run: npm run format:check
+      - run: npm run lint:check
+      - run: npm run test

package.json

@@ -5,7 +5,11 @@
   "main": "index.js",
   "scripts": {
     "start": "node index.js",
-    "test": "echo \": no test specified\"",
+    "test": "echo no test specified",
+    "lint:check": "eslint .",
+    "lint:write": "eslint --fix .",
+    "format:check": "prettier --check .",
+    "format:write": "prettier --write .",
     "prepare": "husky install"
   },
   "lint-staged": {