Add multi-architecture Docker builds for Guix image

[mryashlk]

This title better reflects that the PR:

Implements multi-architecture support (amd64, arm/v7, arm64/v8, ppc64le, 386) Specifically targets Docker image builds Is for the Guix package manager image

This is more descriptive than just "Multi arch builds" and helps reviewers immediately understand the scope and purpose of the changes.

@viferga