allow custom kwok instance-types at runtime

[alec-rabold]

Description

What problem are you trying to solve?

When using the KWOK cloud-provider, I'd like to be able to pass a custom instance-types.json file at startup time (currently this required recompiling Karpenter from source).

A few immediate use-cases include:

• tweaking node ephemeral-storage capacity
• including / excluding "exotic" instance types
  (also custom naming for the instance types in metrics)

My hope is to be able to more easily run "experiments" with the above modifications before making those changes to a real cluster.

Started a PR for this feature here: #1847

How important is this feature to you?

This would make setting up a custom environment simpler, instead of needing a unique image for each combination of instance-types.

(as a side-note, it would be amazing if there was a publicly hosted karpenter-provider-kwok image 😄)

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[jonathan-innis]

Nice! Saw the PR and this seems great! Pretty annoying to have to recompile every time :)

[jonathan-innis]

/triage accepted