Doesn't Support Multi-Platform Builds w/ Platform Native Runners

I'm trying to pre-build an image that supports both amd64 & arm64, additionally I'm generating a large matrix of versions(12 image variations will be built). My goal is to build the amd64 version of the images on native GitHub Runners and then the arm64 version of the images on a self-hosted arm64 GitHub Runner. There is some documentation about attempting this however I'm finding it a challenge to find the build results locally in the runners so that I can upload them for a later job that will generated the multi-platform manifest.

Here is the part of my workflow where I'm attempting to use skopeo to pull the container image to then upload as an artifact.

https://github.com/ndigitals/wp-dev-container/blob/fix/Container-Image-Copy/.github/workflows/release-build.yml#L79-L107