Support multiarch avalanchego images

[exdx]

Currently avalanchego is built using the default GH runner platform amd64

avalanchego/.github/workflows/publish_image.sh

Line 29 in b820b46

docker image push -a $avalanchego_dockerhub_repo

.

Supporting arm64-based images can be extended via docker buildx --platform linux/arm64, linux/amd64. However, the avalanchego go binaries need to be built for arm64 architecture as well, not just the docker images. So CI work may be required.

[exdx]

We already do build arm64-based binaries but need to configure CI to pass the arm build artifacts to the arm image.

[github-actions]

This issue has become stale because it has been open 60 days with no activity. Adding the lifecycle/frozen label will cause this issue to ignore lifecycle events.

[joshua-kim]

Closing, #1103