Is your feature request related to a problem? Please describe.
When specifying a private registry for the startupapicheck-job, the image cannot be pulled because the registry does not allow anonymous access.

Describe the solution you'd like
Add support for the spec.imagePullSecrets field in
deploy/charts/cert-manager/templates/startupapicheck-job.yaml,
allowing users to specify an image pull secret for authenticating to private registries.

Describe alternatives you've considered
Since this is a minor and consistent change (the same field is already implemented in other deployments), no alternative approach has been considered.

/kind feature