Draft: ci: enable multiplatform builds with docker buildx

• Build from the Dockerfile and copy the artifacts from the resulting image

• Use cross-compilation at build stage when building for a foreign architecture

• Use docker buildx build ... in CI to enable multiplatform builds. If buildx is not installed use: DOCKER_BUILDKIT=1 docker build ...

• Gilab runner must expose tag 'multiplatform' which means it has native amd64 arch + emulated arm64 support: https://github.com/tonistiigi/binfmt/tree/deploy/v7.0.0-28#installing-emulators

    $ docker run --privileged --rm tonistiigi/binfmt --install arm64

• Use lto = thin for release profile

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@HugoTrentesaux : setting you as reviewer. But I think @moul should review as well since it is CI related.

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I do not have enough competences in:

• docker
• CI

to review these changes.