build: move CI to GitHub Actions

Reduce CI time by moving to GitHub Actions.

Fixes: nodejs#312

.github/workflows/push.yml

@@ -0,0 +1,51 @@
+name: on push or pull_request
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        node-version: [8.x, 10.x, 11.x]
+        os: [ubuntu-latest, macos-latest]
+    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 Linux
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          sudo apt-get -qq update
+          sudo apt-get install lldb-3.9 liblldb-3.9-dev lcov -y
+      - name: install npm dependencies
+        run: npm install --llnode_build_addon=true --llnode_coverage=true
+      - name: npm install, build, and test
+        run: |
+          TEST_LLDB_BINARY=`which lldb-3.9` npm run nyc-test-all
+      - name: coverage
+          npm run coverage
+          npm run codecov-upload
+        env:
+          CI: true
+  linter:
+    runs-on: [ubuntu-latest]
+    steps:
+      - uses: actions/checkout@v1
+      - name: Use Node.js LTS
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+      - name: npm install, build, and test
+        run: |
+          sudo apt-get -qq update
+          sudo apt-get install lldb-3.9 liblldb-3.9-dev lcov -y
+          npm install
+          npm run linter