Service port mappings for integration test

[octonato]

Currently, service-port-mappings properties are not read during integration tests.

Arguably, a test involving other services would be more suitable for an end-to-end test.

One possible alternative is to let the integration testkit rely on docker compose. https://java.testcontainers.org/modules/docker_compose/

If the integration tests were based a docker-compose file, it would read any configured service-port-mappings out-of-the-box.