Is it possible that BuildKit doesn't download the base image of non-default platform?

[Shubhranshu153]

Question is with respect to nerdctl doing a check to decide the --output type. Would like to understand buildkit perspective of output type. Does the output type needs to be docker or oci when building for a non default platform?

It's possible that BuildKit doesn't download the base image of non-default platform (e.g. when the provided
// Dockerfile doesn't contain instructions require base images like RUN) even if --output type=image,unpack=true
// is passed to BuildKit. Thus, we need to use type=docker or type=oci when nerdctl builds non-default platform
// image using platform option.