Merge Docker manifests from different runners

[diehard2]

Description

I've followed the steps here - https://docs.docker.com/build/ci/github-actions/multi-platform/
but I've been unable to get it to work for a custom registry. Its also extremely difficult to both understand and debug

adding an option in this action such as

'merge-manifests' that replaces all of that code would make this far simpler. With more runners allowing for ARM builds, this would let people avoid QEMU emulation and parallelize their build configurations far more easily

[crazy-max]

I've followed the steps here - https://docs.docker.com/build/ci/github-actions/multi-platform/
but I've been unable to get it to work for a custom registry.

Can you create a bug report with workflow and logs so we can take a look?

Its also extremely difficult to both understand and debug

Yes this has been raised in #671 as well. We also want to ease distributed builds by using subactions for both build-push-action and bake-action.

'merge-manifests' that replaces all of that code would make this far simpler.

Can you explain how this merge-manifests input would work?

this would let people avoid QEMU emulation

This will not avoid QEMU on GitHub hosted runners, it will just build on a dedicated runner.