Consider running `buildx` on a docker container instead of host

[pablomendezroyo]

The command buildx is used by the SDK to create arm and amd architecture images. If this docker plugin is not available in the host then the sdk will not work.

Consider using the buildx inside a docker container instead from the host machine

Ref: https://docs.docker.com/build/install-buildx/

[pablomendezroyo]

This would make the sdk agnostic of the host environment and would lead to much less errors and even windows/mac compatibility

cc @3alpha @Marketen @dsimog01