b9c65e59b2
- Omit the redundant `v8` variant for arm64 when rendering `description`, so equal arm64 platforms always describe as `linux/arm64` — matching how Docker and containerd display the platform. Other variants (`arm/v7`) and architectures (`amd64`) are unaffected. - Only the rendered `description` changes. The stored `variant` and the `Codable` encoding are untouched, so OCI content digests remain stable. - Closes apple/container#1542 (normalization-consistency aspect).