Build Linux/arm64 version of containers

[ronaldtse]

Using docker's buildx:

• GitHub Action: https://github.com/docker/setup-buildx-action
• https://carlosedp.medium.com/cross-building-arm64-images-on-docker-desktop-254d1e0bc1f9
• https://community.arm.com/arm-community-blogs/b/tools-software-ides-blog/posts/getting-started-with-docker-on-arm

[CAMOBAP]

Done some time ago https://github.com/metanorma/metanorma-docker/actions/runs/2309875747