tests: add GitHub Actions CI (#418)

* tests: add GitHub Actions CI

* fix: add missing newline at the end of ci.yml

* fix: add `pull_request` trigger to GitHub Workflows

Co-Authored-By: Michaël Zasso <targos@protonmail.com>

* fix: add missing `npm install`

* fix: add fail-fast: false to ci.yml

Co-Authored-By: XhmikosR <xhmikosr@gmail.com>

* fix: Split npm install and npm run test in ci.yml

Co-authored-by: Michaël Zasso <targos@protonmail.com>
Co-authored-by: XhmikosR <xhmikosr@gmail.com>

.github/workflows/ci.yml

@@ -0,0 +1,22 @@
+name: GitHub Actions CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+        node-version: [6.x, 8.x, 10.x, 12.x]
+    steps:
+    - uses: actions/checkout@v1
+    - name: Use Node.js ${{ matrix.node-version }} on ${{ matrix.os }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - name: npm install
+      run: npm install
+    - name: npm run test
+      run: npm run test