Compatibility with Kubernetes

[riccardomessineo]

Hello there,
I am trying to replicate a perfectly running docker-compose config on a k8s cluster using the virtual hosted style feature.
Listing the buckets works fine, but accessing the files of a bucket returns an empty set.
I'm pretty sure it's a problem related to virtual hosted style buckets on k8s, and I have a hint on where the problem is:
https://github.com/scireum/s3ninja/blob/master/src/main/java/ninja/S3Dispatcher.java#L287

While figuring out how to make the s3 request you try to understand the local domains with:
https://github.com/scireum/s3ninja/blob/master/src/main/java/ninja/S3Dispatcher.java#L161-L179

To make it work on docker-compose I had to set the hostname property to s3ninja.dev, but on k8s this is not possible!

To fix this can you add a "baseurl" on the config file in the "http" section and use it in the DOMAINS as a value?
If I knew Java I would PR this fix...