.github: init nodejs-ci workflow.

.github/workflows/nodejs-ci.yml

@@ -0,0 +1,23 @@
+name: Node.js CI
+
+on: push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          cache: 'yarn'
+
+      - name: Install dependencies
+        run: yarn install
+
+      - name: Run tests
+        run: yarn test