ci: add github actions CI

Keeping Azure DevOps one for now as a comparison point

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: build
+on:
+  push
+  schedule:
+    - cron: '0 12 * * 1'
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        platform: [ubuntu-latest, macos-latest, windows-latest]
+        node-version: [10.x, 12.x]
+
+    runs-on: ${{ matrix.platform }}
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+
+    - name: Install dependencies
+      run: |
+        npm install
+        npm link
+      env:
+        CI: true
+
+    - name: Run unit tests
+      run: |
+        npm run lint
+        bash -c "scripts/test.sh"