ci: add GitHub Actions CI workflow with mocha and eslint

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: src
+    strategy:
+      matrix:
+        node-version: [18]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint
+        continue-on-error: true
+
+      - name: Test
+        run: npm test

src/package.json

@@ -7,7 +7,9 @@
     "example": "examples"
   },
   "scripts": {
-    "test": "mocha 'test/**/*.test.js'"
+    "test": "mocha 'test/**/*.test.js'",
+    "lint": "eslint .",
+    "lint": "eslint ."
   },
   "repository": {
     "type": "git",