Add CI workflow

Author: danielbayerlein

.github/workflows/ci.yml

@@ -0,0 +1,15 @@
+name: CI
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: '14.x'
+      - run: npm ci
+      - run: npm test