install docker-buildx

sudo apt-get install jq curl -y

mkdir -p ~/.docker/cli-plugins

BUILDX_URL=$(curl -fsSL | jq -r .assets[].browser_download_url | grep linux-amd64)
curl -fsSL -o ~/.docker/cli-plugins/docker-buildx $BUILDX_URL
chmod +x ~/.docker/cli-plugins/docker-buildx
docker buildx --help

Usage:  docker buildx [OPTIONS] COMMAND

Build with BuildKit

      --builder string   Override the configured builder instance

Management Commands:
  imagetools  Commands to work on images in registry

  bake        Build from a file
  build       Start a build
  create      Create a new builder instance
  du          Disk usage
  inspect     Inspect current builder instance
  ls          List builder instances
  prune       Remove build cache 
  rm          Remove a builder instance
  stop        Stop builder instance
  use         Set the current builder instance
  version     Show buildx version information 

Run 'docker buildx COMMAND --help' for more information on a command.
docker buildx build --platform linux/amd64,linux/arm64 -t testb:1 .
[+] Building 0.0s (0/0)                                                                                                                                               
error: multiple platforms feature is currently not supported for docker driver. Please switch to a different driver (eg. "docker buildx create --use")

docker buildx create --name mbuilder --use

docker buildx build --platform linux/amd64,linux/arm64 -t testb:1 .

docker buildx imagetools inspect testb:1

docker run --privileged --rm tonistiigi/binfmt --install all