Move from Travis-CI to Github Actions

Author: daurnimator

.github/workflows/ci.yaml

@@ -0,0 +1,30 @@
+name: Node.js CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [12.x, 14.x, 16.x, 17.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v2
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'yarn'
+    - name: Install dependencies
+      run: yarn
+    - run: yarn lint
+    - run: yarn test --maxWorkers=$(nproc)
+      env:
+        FENGARICONF: '{"LUAI_MAXSTACK":100000}'