Switch to GitHub Actions (#293)

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: ci
+
+on:
+  push:
+    branches:
+      - "master"
+  pull_request:
+
+jobs:
+  linux_tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        php: [5.4, 5.5, 5.6, 7.0, 7.1, 7.2, 7.3, 7.4]
+
+    name: PHP ${{ matrix.php }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+
+      - name: Clone simpletest
+        run: git clone --depth=50 https://github.com/ezyang/simpletest.git
+
+      - name: Configure simpletest
+        run: cp test-settings.travis.php test-settings.php
+
+      - name: Execute Unit tests
+        run: php tests/index.php