Repacks geoserver adding UVMS specific configuration.
Care must be taken when upgrading GeoServer since e.g. web.xml has been modified and depending on the changes made in the new release will have to be brought in to this repository as well. Failure to do so might result in GeoServer not working as intended.
Uses geoserver minimal as the base and then adding UVMS specific changes (styling, workspaces, usm4uvms AuthenticationFilter).
The base was chosen since it's an "empty" GeoServer data directory and is thus not subject to a data license.