Document the steps for an air gap environment

[juliusvonkohout]

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• Is this a Kubeflow issue?
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• Did you follow the installation guide https://github.com/kubeflow/manifests?tab=readme-ov-file ?
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Version

master

Describe your issue

Related to kubeflow/kubeflow#6919. Since we now have a rough upgrade guide I would like to add a rough air gap section to the Readme. @diegolovison

Steps to reproduce the issue

We could rely on the extract images script and https://www.deploykf.org/guides/platform/offline/

Put here any screenshots or videos (optional)

No response

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[juliusvonkohout]

/lifecycle frozen