Apply rector, phpstan and php-cs-fixer

.drone.yml

@@ -9,22 +9,29 @@ steps:
   - composer install
 
 - name: phpstan
-  image: php:8
+  image: php:8.1
   depends_on:
   - install
   commands:
   - vendor/bin/phpstan analyse
 
+- name: rector
+  image: php:8.1
+  depends_on:
+    - install
+  commands:
+    - vendor/bin/rector process --dry-run
+
 - name: phpunit
-  image: php:8
+  image: php:8.1
   depends_on:
   - install
   commands:
   - vendor/bin/phpunit
 
 - name: style check
-  image: php:8
+  image: php:8.1
   depends_on:
   - install
   commands:
-  - PHP_CS_FIXER_IGNORE_ENV=true vendor/bin/php-cs-fixer fix
+  - vendor/bin/php-cs-fixer fix