chore: add vant-cli build to actions

.github/workflows/test.yml

@@ -35,3 +35,17 @@ jobs:
       uses: codecov/codecov-action@v1
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-node@v1
+      with:
+        node-version: '12.x'
+
+    - name: Install dependencies
+      uses: bahmutov/npm-install@v1
+
+    - name: Build
+      run: npm run build