[docker/cli] Why Do ARMv8 and ARMv9 Images Both Appear Only as arm64?

### ROOT CAUSE The issue arises because Docker uses the `arm64` architecture tag for both ARMv8 and ARMv9, as `arm64` is the standard architecture for 64-bit ARM. There is no separate architecture tag for ARMv8 or ARMv9 in Docker's manifest list. This is a design choice in Docker to simplify multi-architecture support. ### CODE FIX No code fix is required in Docker itself, as this behavior is by design. However, users can work around the confusion by explicitly specifying the platform during image pulling or building: 1. **Pulling Images for a Specific Architecture:** - Use the `--platform` flag with `docker pull` to target a specific architecture: ```bash docker pull --platform linux/arm64v8 myimage:latest docker pull --platform linux/arm64 myimage:latest ``` - Note: `linux/arm64v8` targets ARMv8, while `linux/arm64` (or `linux/aarch64`) targets both ARMv8 and ARMv9. 2. **Building Images for Specific Architectures:** - Use Docker Buildx with platform constraints: ```bash docker buildx build --platform linux/arm64v8 -t myimage:armv8 . docker buildx build --platform linux/arm64 -t myimage:armv9 . ``` This ensures clarity when working with multi-architecture images. The issue is not a bug but a matter of Docker's architecture handling.