put fails silently on `mvnw help:evaluate`

[shua]

the provided settings.xml file requires a value ${repository.url} to be set, which is not set by the out script.

As a result the mvnw help:evaluate call in https://github.com/nulldriver/maven-resource/blob/master/assets/out#L87 fails when trying to retrieve deps using ${repository.url} as the repository.

Since this is a command run when trying to set a sh var, it fails the script silently without any indicator of what went wrong.

Adding maven_opts: -Drepository.url=<your url> to the pipeline params will fix this, but this should probably be fixed in the scripts or config.