Switch CI to GitHub Actions

Author: strugee

.github/workflows/ci.yml

@@ -0,0 +1,31 @@
+name: Run tests
+
+on:
+  push:
+    branches: [ $default-branch ]
+  pull_request:
+    branches: [ $default-branch ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version:
+          - 8
+          - 9
+          - 10
+          - 12
+          - 14
+
+    steps:
+    - uses: actions/checkout@v6
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v6
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'npm'
+    - run: npm ci
+    - run: npm test