Add support for imagePullSecrets for Backup and Restore

[fishday53]

Hi! We use private container registry with authorization.

CR MySQLCluster support imagePullSecrets in the spec.podTemplate.spec, but not in spec.restore.jobConfig.
Also CR BackupPolicy doesn't support it.

Fortunately we can patch created by Operator backup CronJob resource manually, and Operator doesn't prevent imagePullSecrets addition.
But we can't patch created by Operator restore job.batch, so before restoration we have to pull a necessary image to nodes manually.

That would be great to add imagePullSecrets optional specification for BackupPolicy and inherit imagePullSecrets for restore job from MySQLCluster CR.

[shunki-fujita]

@fishday53
Thanks for the suggestion!
I think propagating imagePullSecrets via JobConfig would be sufficient.
https://cybozu-go.github.io/moco/crd_backuppolicy_v1beta2.html#jobconfig

moco/api/v1beta2/job_types.go

Line 11 in 40ebe24

type JobConfig struct {

• backup job
  

  moco/controllers/mysqlcluster_controller.go

  Line 1283 in 40ebe24

  WithSpec(corev1ac.PodSpec().

• restore job
  

  moco/controllers/mysqlcluster_controller.go

  Line 1589 in 40ebe24

  WithSpec(corev1ac.PodSpec().

Would you be interested in contributing a PR for this?