ci: add PHP CS Fixer workflow with matrix support

- Create separate workflow for code style checks
- Use matrix strategy for both PHPStan and Code Style workflows
- Display PHP version in job names for better visibility
- Enable caching for PHP CS Fixer results
- Run CS Fixer in dry-run mode to prevent auto-fixes in CI

Author: valbeat

.github/workflows/code-style.yml

@@ -0,0 +1,51 @@
+name: Code Style
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  php-cs-fixer:
+    name: PHP CS Fixer (PHP ${{ matrix.php-version }})
+    runs-on: ubuntu-latest
+    
+    strategy:
+      matrix:
+        php-version: ['8.4']
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php-version }}
+        coverage: none
+    
+    - name: Cache Composer packages
+      uses: actions/cache@v3
+      with:
+        path: vendor
+        key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-php-
+    
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress
+    
+    - name: Cache PHP CS Fixer
+      uses: actions/cache@v3
+      with:
+        path: .php-cs-fixer.cache
+        key: ${{ runner.os }}-php-cs-fixer-${{ hashFiles('**/.php-cs-fixer.dist.php') }}
+        restore-keys: |
+          ${{ runner.os }}-php-cs-fixer-
+    
+    - name: Run PHP CS Fixer
+      run: composer cs-check
+    
+    - name: Show diff on failure
+      if: failure()
+      run: composer cs-fix -- --diff --dry-run

.github/workflows/phpstan.yml

@@ -8,6 +8,7 @@ on:
 
 jobs:
   phpstan:
+    name: Static Analysis (PHP ${{ matrix.php-version }})
     runs-on: ubuntu-latest
 
     strategy: