Let the console able to build on other architectures and compatible with prow builds

Description of problem:

the console is currently buildable only by the ART team tooling (Dockerfile.product) and by using a multi-stage Dockerfile that currently builds only for amd64.

The Dockerfile.product should (1) be able to build without the ART tooling (i.e., on Prow) and (2) on other architectures than x86.

This, in particular, makes any possible arm64 build of okd fails.