Keep configuration and data in distinct directories This allows having distinct volumes for configuration and data (artifact database, generated mapfiles and shapefiles, etc.). While at it, cleanup MapServer configuration a little bit.

<?xml version="1.0" encoding="UTF-8" ?>
<datacage>
    <user>SA</user>
    <password/>
    <driver>org.h2.Driver</driver>
    <url>jdbc:h2:${artifacts.config.dir}/../artifacts-data/datacagedb/datacage</url>
</datacage>