When kind-mount-root is set in spec.yml, emit a single extraMount
mapping the root to /mnt instead of per-volume mounts. This allows
adding new volumes without recreating the kind cluster.
Volumes whose host path is under the root are skipped for individual
extraMounts and their PV paths resolve to /mnt/{relative_path}.
Volumes outside the root keep individual extraMounts as before.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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