Does Camunda fall back to in-memory H2 if configured DB is not found?

Curious if Camunda automatically fall back to in-memory H2 DB if the configured database, say PostgreSQL, is not found ?
We are seeing an odd behavior where if the DB (in a separate docker container) is not up and running when Camunda comes up it seems to fall back to H2 DB.

@samba.pedapalli remove H2 db driver dependency from process application classpath, then bringdown the postgresql instance. In that case application should fail to start due to datasource unavailability.

Thanks aaravindrs. We will have to modify the standard container, I guess. We were trying to avoid modifying the docker container, except for updating server.xml through Jenkins file.