chore: add github actions

.github/workflows/nodejs.yml

@@ -0,0 +1,26 @@
+name: Node CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [12.x, 14.x]
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: npm ci, build, and test
+        run: |
+          npm ci
+          npm build
+          npm test
+        env:
+          CI: true