Currently there are used two environment variables to define datasource JNDI. They are KIE_SERVER_PERSISTENCE_DS and DB_JNDI. You can see them for example in [1] .
It would be good to unify this information - to remove one of these variables.

[1] https://raw.githubusercontent.com/jboss-openshift/application-templates/bpmsuite-wip/bpmsuite/bpmsuite70-full-mysql.json