Merge branch 'milestone-03' into 'main'

.gitlab-ci.yml

.mvn/wrapper/maven-wrapper.jar

.mvn/wrapper/maven-wrapper.properties

README.md

...ni/fi/pa165/authorization/server/rest/UserController.java

...ni/fi/pa165/authorization/server/service/UserService.java

authorization/src/main/resources/application.yml

...t/java/cz/muni/fi/pa165/authorization/server/UsersIT.java

compose.yaml

core/Dockerfile

core/openapi.yaml

core/pom.xml

...src/main/java/cz/muni/fi/pa165/core/config/AppConfig.java

...main/java/cz/muni/fi/pa165/core/data/domain/Airplane.java

.../java/cz/muni/fi/pa165/core/data/domain/AirplaneType.java

.../main/java/cz/muni/fi/pa165/core/data/domain/Airport.java

...src/main/java/cz/muni/fi/pa165/core/data/domain/City.java

.../main/java/cz/muni/fi/pa165/core/data/domain/Country.java

...c/main/java/cz/muni/fi/pa165/core/data/domain/Flight.java

...java/cz/muni/fi/pa165/core/data/domain/FlightSteward.java