Use Github actions for CI

.github/workflows/ci.yaml

@@ -0,0 +1,42 @@
+name: ci
+
+on:
+  push:
+    branches: [$default-branch]
+  pull_request:
+    branches: [$default-branch]
+
+jobs:
+  build:
+    runs-on: ubuntu-18.04
+    strategy:
+      matrix:
+        node-version: [10.x, 12.x, 14.x, 15.x]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Install dependencies
+        run: |
+          sudo add-apt-repository -y ubuntu-toolchain-r-test
+          sudo apt-get -y update
+          sudo apt-get install -y python3 make g++-4.8
+      - run: npm ci
+      - run: npm test
+
+  build-alpine:
+    runs-on: ubuntu-18.04
+    strategy:
+      matrix:
+        node-version: [10, 12, 14, 15]
+    container:
+      image: node:${{ matrix.node-version }}-alpine
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install dependencies
+        run: |
+          apk add make g++ python
+      - run: npm ci --unsafe-perm
+      - run: npm test --unsafe-perm