Adding csfixer and workflow

Author: erikaheidi

.github/workflows/php.yml

@@ -0,0 +1,27 @@
+name: PHP Composer
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Validate composer.json and composer.lock
+      run: composer validate
+
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress
+
+    - name: Run test suite
+      run: composer test
+
+    - name: Run php-cs-fixer
+      run: composer csfix

composer.json

@@ -14,7 +14,8 @@
         "minicli/minicli": "^3.2"
     },
     "require-dev": {
-        "pestphp/pest": "^2.4"
+        "pestphp/pest": "^2.4",
+        "friendsofphp/php-cs-fixer": "^3.16"
     },
     "scripts": {
         "test" : ["pest"],