build(ci): use github actions

.github/workflows/ci.yml

@@ -0,0 +1,17 @@
+name: Node.js CI
+
+on: 
+  push:
+    branches: 
+      - '*'
+jobs:
+  build:
+    runs-on: ubuntu-18.04
+    name: Test
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v1
+      with:
+        node-version: '12'
+    - run: yarn
+    - run: yarn test