improvements from Maik

src/main/resources/application.properties

@@ -20,5 +20,5 @@ spring.security.oauth2.client.provider.keycloak.jwk-set-uri = ${keycloak.openid-
 spring.security.oauth2.client.provider.keycloak.user-name-attribute = preferred_username
 
 # application
-server.port = 9001
+server.port = ${server.port}
 server.servlet.context-path = /timetrack