Feature/multiarch docker

[cognitivegears]

I made a few improvements to the Docker build process, including:

• Upgrading to node v20
• Upgraded the qemu and buildx action versions
• Reordered some of the Dockerfile to avoid snapshot changes on each code change
• Updated the image to use bookworm instead of buster

These changes appear to also have fixed the issue with networking on the build along the way. See build (https://github.com/NuSkooler/enigma-bbs/actions/runs/6526380735) for a successful run.

Note I have not tried running these docker containers on real hardware yet, this needs to be tested.