This is a generic MYSQL image which has an init script that would creates the required db and tables for the petclinic app.
This would be a pre-requitie for starting relevancelab/tomcatpet:latest image.
To run the image use the below command
docker run -t -d -i --name mysqlpet relevancelab/mysqlpet:lastest
docker exec mysqlpet bash init.sh
On catalyst use init.sh as an additional startup command.