In order to make Jenkins logs easier to ingest, we'd like to support using custom log formatters, such as the Elastic Common Schema (ECS) formatter (https://github.com/elastic/ecs-logging-java)

As discussed in https://github.com/jenkinsci/docker/issues/1105, there's currently no support for this in Winstone, so we have to patch the `run.sh` script to use the `-cp` java option rather than using the `-jar` option, as they're mutually exclusive...

I did try the `-extraLibFolder` arg as referenced in the above issue, but the formatter doesn't get picked up...