The OpenShift folks could treat the "AeroGear UnifiedPush Cartridge" (in terms of a database) similar to something like Drupal (which just needs a database), this would "ensure" a database is present, when the JBoss Application Server boots.

AeroGear UnifiedPush "binds" to a JNDI name (PushEEDS) for the Database.

OpenShift has a MySQL cartridge, which defines the "MysqlDS" JNDI name:
https://github.com/openshift/origin-server/blob/master/cartridges/openshift-origin-cartridge-jbossas/versions/7/standalone/configuration/standalone.xml#L103

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