added env variable to ignore php-cs-fixer error with PHP 8.4

Author: akimoto

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
         run: composer install --prefer-dist --no-progress
 
       - name: Check coding standards (optional)
-        run: vendor/bin/php-cs-fixer fix --dry-run --diff
+        run: PHP_CS_FIXER_IGNORE_ENV=1 vendor/bin/php-cs-fixer fix --dry-run --diff
 
       - name: Run tests (PHPUnit)
         run: vendor/bin/phpunit