When jpackage builds a native package from the predefined app image (the "--app-image" option on the command line), it ignores the "--launcher-as-service" option. When the "--launcher-as-service" option is present, jpackage must output a native package that should install the main launcher as a service, but it doesn't.

The issue was uncovered when improving the coverage of the ServiceTest test by adding test cases for the above scenario.