Fix annoying PHP-CS-Fixer error

Author: curry684

.github/workflows/ci.yaml

@@ -58,6 +58,8 @@ jobs:
       - name: Check code style
         run: vendor/bin/php-cs-fixer fix --dry-run
         if: ${{ matrix.dependencies == 'stable' && !matrix.experimental }}
+        env:
+          PHP_CS_FIXER_IGNORE_ENV: 1
 
       - name: Run PHPStan static analysis
         run: vendor/bin/phpstan