feat(arch): arm64 image

[megglos]

WIP not ready yet.

Would resolve #205
Relates to #CAM-14301

See
https://docs.docker.com/buildx/working-with-buildx/#build-multi-platform-images
https://docs.docker.com/ci-cd/github-actions/
https://github.com/docker/setup-buildx-action#with-qemu

[megglos]

this just achieves making the final images pushed multiarch so the test pipeline is actually not making use of those, leaving the chance for undetected broken arm64 images.

Testing of each arch is a bit more tricky to achieve as we would need to also use qemu to test non amd64 images, something like https://github.com/uraimo/run-on-arch-action might be helpful, but this one doesn't support the amd64 arch yet, however they are working on it: uraimo/run-on-arch-action#58

[CLAassistant]

All committers have signed the CLA.

[ghost]

When will this be merged? Would be great to have the arm image for the Apple Silicon.

[patrick-werner]

Waiting for this to get merged, the x86 image isn't usable on Apple Silicon

[megglos]

closing as this will be done by the platform team