chore: update Node.js to 18.x and add GitHub Actions workflow

Co-Authored-By: Michael Latman <[email protected]>

.github/workflows/test.yml

@@ -0,0 +1,29 @@
+name: Test
+
+on:
+  pull_request:
+    branches: [ main ]
+  push:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Use Node.js 18.x
+      uses: actions/setup-node@v3
+      with:
+        node-version: '18.x'
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Run tests
+      run: npm test
+
+    - name: Build
+      run: npm run build