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How do I run a CronJob inside a container with a predefined Image?

I have a Kubernetes Deployment, in whose Pods I need a command run periodically. The Kubernetes CronJob object creates a new Pod. I would prefer to specify a cronjob, that runs inside the container of the Pod. Is there any way, I can specify this in the deployment yaml?

I have no access to the Dockerfile, but am using pre-built Images.