Docker image arch

[Gujiawei-Edinburgh]

Missing Arch for Docker image

I found that the docker build script only use the docker daemon arch, which will cause miss other arch, e.g., arm64

The build command should be something like

docker buildx build \
  -f "$dockerfile" \
  --platform linux/amd64,linux/arm64 \
  --build-arg BIFROMQ_VERSION="$version" \
  -t "$tag" \
  "$context_dir" \
  --push

[popduke]

Merged. linux/arm64 build will be enabled in next release.