Add PHP workflow action

Author: chadicus

.github/workflows/php.yml

@@ -0,0 +1,29 @@
+name: PHP Composer
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        php-versions: ['7.0', '7.3', '7.4']
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Install PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php-versions }}
+    - name: Validate composer.json and composer.lock
+      run: composer validate
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress
+    - name: Run PHPCS
+      run: composer run-script lint
+    - name: Run PHPUnit
+      run: composer run-script test