Update registry template

[zhengtianbao]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR add extra options of docker registry yaml config

• Add liveness and readiness Probes
• Add Replica setting for HA
• Set the security context

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Update registry template with additional options (security context and proves) and variables (`registry_storage_access_mode` to changes access mode, `registry_replica_count` for replicas)

[k8s-ci-robot]

Hi @zhengtianbao. Thanks for your PR.

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[cristicalin]

Do all storage backends support multiple registry replicas? Maybe there should be a sanity check as well.

[zhengtianbao]

Do all storage backends support multiple registry replicas? Maybe there should be a sanity check as well.

Thanks for your review, I suppose we can't do the check because have no idea what registry_storage_class will be used by user setting. kubespray will deploy registry use emptyDir as volume by default. If user set the option registry_storage_class, they should know that if the storageClass provisioner support multi replicas reading and writing data simultaneously.

[cristicalin]

You can still check if registry_storage_class and registry_storage_access_mode is ReadWriteMany.

On a second note, I think adding this parametrization warrants a mention in the docs.

[cristicalin]

Nice work @zhengtianbao !

/ok-to-test
/lgtm

[jayonlau]

/lgtm

[floryut]

@zhengtianbao Thanks 👍

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, zhengtianbao

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