Added code formater while building and .gitlab-ci

.gitlab-ci.yml

.../src/main/java/cz/muni/fi/pa165/core/CoreApplication.java

.../src/main/java/cz/muni/fi/pa165/core/DataInitializer.java

.../main/java/cz/muni/fi/pa165/core/common/DomainMapper.java

.../main/java/cz/muni/fi/pa165/core/common/DomainObject.java

...main/java/cz/muni/fi/pa165/core/common/DomainService.java

core/src/main/java/cz/muni/fi/pa165/core/user/User.java

.../main/java/cz/muni/fi/pa165/core/user/UserController.java

.../src/main/java/cz/muni/fi/pa165/core/user/UserMapper.java

.../main/java/cz/muni/fi/pa165/core/user/UserRepository.java

...src/main/java/cz/muni/fi/pa165/core/user/UserService.java

core/src/main/java/cz/muni/fi/pa165/core/user/UserType.java

.../test/java/cz/muni/fi/pa165/core/CoreApplicationTest.java

...ce3/src/main/java/cz/muni/fi/pa165/microservice3/App.java

...src/test/java/cz/muni/fi/pa165/microservice3/AppTest.java

...ce4/src/main/java/cz/muni/fi/pa165/microservice4/App.java

...src/test/java/cz/muni/fi/pa165/microservice4/AppTest.java

...va/cz/muni/fi/pa165/model/dto/common/DomainObjectDto.java

...n/java/cz/muni/fi/pa165/model/dto/user/UserCreateDto.java

...rc/main/java/cz/muni/fi/pa165/model/dto/user/UserDto.java