chore: Test with GitHub Actions

Add a workflow to run tests with GitHub Actions.

Author: richardlau

.github/workflows/ci.yml

@@ -0,0 +1,31 @@
+name: Node CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version:
+        # See https://github.com/nodejs/node-inspect/pull/78
+        # - 10.x
+        - 12.x
+        - 13.x
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - name: npm install, build, and test
+      run: |
+        npm install
+        npm run build --if-present
+        npm test
+      env:
+        CI: true