Support multi arch build using buildx

[rverma-dev]

Description

With aws graviton and many other arm systems on the rise, it is good to have multi arch images.

Proposed solution

Have a way to leverage buildx to build the multiarch images for defined platforms. Document an example for the same.

[jromero]

Given that this is associated with ARM could you provide the specific configuration you're wishing to be possible?

Here's a "matrix" of all the components and how they interact. It would be nice to know which configuration is so that we may prioritize it appropriately.

Could your request be more-or-less formulated in the same way as... ?

The user wants to build an ARM image using amd64 buildpacks on a docker host running on amd64 from their workstation running on amd64.

[natalieparellano]

@jromero did you mean to link this document? FYI for those interested, there is an #arm channel in CNB Slack where some discussion is taking place.

[darylrobbins]

Lifecycle 0.12 now has arm support.

[dm3ch]

I have similar use-case. I believe author of this issue meant use case like docker buildx allows to achieve using --platform linux/amd64,linux/arm64. It could be described using the sentence from document (mentioned in #1171 (comment)) the following way:

• The user wants to build a multi-arch docker image containing ARM and x86_64 images using amd64 buildpacks on a docker host running on amd64 from their workstation running on amd64.
• The user wants to build a multi-arch docker image containing ARM and x86_64 images using arm64 buildpacks on a docker host running on arm64 from their workstation running on arm64.

[natalieparellano]

Duplicate of #1570