server-config not reflected in produced image

when setting 

<server-config>standalone-full.xml</server-config>

and runing 

mvn wildfly:image

packaging-scripts do change standalone-full.xml, but the wildfly that is started in the container still uses standalone.xml (instead of standalone-full.xml as expected).

This can be worked around by setting a SERVER_ARGS environment variable to 

-Djboss.server.default.config=standalone-full.xml

when starting the docker container.