Bug found after https://issues.redhat.com/browse/KOGITO-1956 has been implemented.
Set `MAVEN_REPO_URL` only on a build config (with no mirror_url specified).
If the Openshift has the MAVEN_MIRROR_URL by default, then that one is taken instead of the specific maven repo weheras this one hsould have the priority.
We should update the maven configuration in S2I image to not write the mirror url if maven repo is specified ...