airgap kurl upgrades should only need to be run on one node

[laverya]

Today, when updating a kurl cluster, there's a prompt to run a script to load images on the other nodes. While this works, this isn't a great experience, and can lead to issues if the script is not run.

It should be possible to bootstrap a registry and then rely on that instead of loading images local to every node.

[MikaelSmith]

Also the command documented at https://kurl.sh/docs/install-with-kurl/upgrading#airgap isn't valid, should probably be something like cat tasks.sh | sudo bash -s load-images.

[camilamacedo86]

Hi @laverya,

It is open for a long period. Do you think that still valid we keep this one or it is something that no longer is required?