Add auto-test workflow for CI (#842)

Author: Yzing

.github/workflows/auto-test.yml

@@ -0,0 +1,25 @@
+name: 🧪 Auto Test
+
+on:
+  push:
+    branches:
+      - '**'  # all branches
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    if: "!contains(github.event.head_commit.message, '[skip ci]')"
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Use Node.js 16.x
+        uses: actions/setup-node@v2
+        with:
+          node-version: '16.x'
+
+      - name: Install dependencies
+        run: npm install --no-package-lock
+
+      - name: Run tests
+        run: npm run test