Build can fail with EOF errors when fetching from cache.
Add fallback to build from source if cache fails.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
skopeo needs /var/tmp or /tmp for temporary files when copying
docker-archive images. Use --tmpdir flag to explicitly use /tmp.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>