Develop way to simulate airgap locally and in CI

[johnSchnake]

The airgap example is always painful to try and reproduce and we don't have a great story for users even though we've done so much to make things easier. We need a simpler way to iterate so that we can further improve things.

[johnSchnake]

https://github.com/kubernetes-sigs/kind/issues/2776

Able to get this working locally but I needed a custom build of kind with my own tweaks and another container on that airgapped network to work from (so you need to mount the kubeconfig, sonobuoy, kubectl)

In addition, we'll need to either preload the images we want into it and/or set up a custom registry for those tests. The former is easier/faster but it probably wouldn't integrate with things like imgpkg/kbld since those want to push/pull.

[stale[bot]]

There has not been much activity here. We'll be closing this issue if there are no follow-ups within 15 days.