Publish Docker multi-platform images

[edgarmiro]

Is your feature request related to a problem? Please describe.
The image published arch is linux/amd64 which means, it can't be used on arm machines raising this error:
mocksserver The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested

Describe the solution you'd like
Build and upload arm images with Docker multi-platform images: https://docs.docker.com/build/building/multi-platform/

Describe alternatives you've considered
I used this env var as a workaround but it's not the best option.
export DOCKER_DEFAULT_PLATFORM=linux/amd64