Set up GitHub Actions

Author: mheap

Diff for: .github/workflows/push.yml

@@ -0,0 +1,28 @@
+name: CI
+on: [push, pull_request]
+jobs:
+  run:
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: [ubuntu-latest, windows-latest, macos-latest]
+        php-versions: ['7.3', '7.4']
+    name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v1
+      with:
+        php-version: ${{ matrix.php-versions }}
+        coverage: xdebug
+
+    - name: Composer dependencies
+      run: composer install --no-ansi --no-interaction --no-scripts --no-suggest --no-progress --prefer-dist
+
+    - name: Run phpunit
+      run: ./vendor/bin/phpunit
+
+    - name: Run phpcs
+      run: ./vendor/bin/phpcs