At Ubicloud, we have ARM64 runners. They are compatible with Github Runners. It is just one line change in your workflow file. It is also 6x more cost effective than Github Runners (btw. our x64 runners are 10x more cost effective)
More informative can be found here https://www.ubicloud.com/use-cases/github-actions
and here https://www.ubicloud.com/docs/github-actions-integration/qui...