[SRE-4238] Use Github Actions to test and release multi-platform docker image

[itskingori]

So that we can target linux/amd64 and linux/arm64.

Checklist

• Delete automated builds on Docker Hub
• Delete webhooks on repo related to Docker Hub

References

• GitHub Actions
  • https://github.com/actions/checkout
  • https://github.com/actions/create-release
  • https://github.com/docker/setup-qemu-action
  • https://github.com/docker/setup-buildx-action
  • https://github.com/docker/login-action
  • https://github.com/docker/build-push-action
  • https://github.com/docker/metadata-action
  • https://github.com/peter-evans/dockerhub-description
• Docker Hub
  • https://docs.docker.com/build/ci/github-actions/test-before-push/
  • https://docs.docker.com/build/ci/github-actions/multi-platform/
  • https://docs.docker.com/build/ci/github-actions/secrets/
  • https://docs.docker.com/build/ci/github-actions/manage-tags-labels/
  • https://docs.docker.com/build/ci/github-actions/cache/
  • https://docs.docker.com/build/ci/github-actions/update-dockerhub-desc/