Question: can we extract KOCACHE instead of saving it to disk to be able use it between stateless builds?

AFAIK, KOCACHE only accepts directories as a value. But we couldn't use this cache between stateless builds. For example, each workflow run executes in a fresh VM in GitHub Actions.

It'd be nice if we could use OCI registries to save the cache for ko builds.

Start by tracing how KOCACHE is currently handled and how ko builds run in fresh GitHub Actions VMs. Investigate the requirements and design for storing and retrieving the cache through OCI registries. Done means stateless builds can reuse a KOCACHE-compatible cache between workflow runs.

Written by the indexing model from the issue text.