ci: Add Node.js CI with pnpm

Install and configure pnpm for Node.js CI

made by ollama-commit

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: Node.js CI with pnpm
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: "16.x"
+          cache: "pnpm"
+      - name: Install pnpm
+        run: npm install -g pnpm
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+      - name: Build
+        run: pnpm run build