Support pathStyleAccess=false / bucket subdomains

[agudian]

AWS has announced to deprecate pathStyleAccess in the foreseeable future.

The S3 mock server could support that when running in Docker, with properly configured Docker network and alias settings, and then maybe checking the request for the used subdomain name.

Dynamically creating buckets won't be possible, though.

The challenge is to do that without having to duplicate the complete API controller and to provide proper testing within the Maven build.