Add manage-offline-container-images.sh

[oomichi]

What type of PR is this?

/kind feature

What this PR does / why we need it:

One challenge of offline deployment was how to collect necessary container images as a preparation.
This adds a script to solve it.
Kubespray has the option registry_enabled to deploy container registry locally, but we cannot use it for this case because we need to deploy container registry before Kubernetes deployment but the option requires Kubernetes deployment in advance.

Does this PR introduce a user-facing change?:

Add manage-offline-container-images.sh to collect necessary container images and register the images to local registry.

[oomichi]

/retest

[oomichi]

Kubespray contains a role for deploying a local container registry.
It is better to use it.

[oomichi]

Kubespray contains a role for deploying a local container registry.

Kubespray has the option registry_enabled to deploy container registry locally, but we cannot use it for this case because we need to deploy container registry before Kubernetes deployment but the option requires Kubernetes deployment in advance.

[floryut]

@oomichi Did you check #6766 ? As it's quite stale, maybe try to include some of it, WDYT ?

[oomichi]

@floryut
Thanks for your comment. I reviewed the other PR.

[floryut]

@floryut
Thanks for your comment. I reviewed the other PR.

Are you finish in this one?
I was thinking about merging or cherry picking the other one if anything is interesting otherwise I'm fine to merge this one as it is.

Up to you @oomichi :)

[oomichi]

@floryut
Thanks for your comment. I reviewed the other PR.

Are you finish in this one?
I was thinking about merging or cherry picking the other one if anything is interesting otherwise I'm fine to merge this one as it is.

Up to you @oomichi :)

Yes, I finished this PR work already :-)
I have confirmed this PR script works fine on my environment, and I'd like to share the script to get more feedback to improve it in the community.

At this time, I cannot get replies related to my review points on the other PR yet.
It is a nice idea to bring good features from the other one after getting replies based on this.

[floryut]

/cc @EppO
Could you check and lgtm if ok for you ?

[floryut]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[EppO]

/lgtm