add github/workflows

Author: Maxofil

.github/workflows/php.yml

@@ -0,0 +1,36 @@
+name: PHP
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: '7.4'
+        coverage: xdebug    
+      env:
+        update: true
+
+    - name: Validate composer.json and composer.lock
+      run: composer validate
+        
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress --no-suggest
+    
+    - name: Tests
+      run: composer run-script phpunit
+
+    - name: Mutation tests
+      run: composer run-script infection
+      env:
+        STRYKER_DASHBOARD_API_KEY: ${{ secrets.STRYKER_DASHBOARD_API_KEY }}