Adds Docker for firmware-building

This commit adds a Dockerfile to build a docker container to build the firmware with. It also updates the documentation on how to do that.

Looks good to me! Thanks for keeping our codebase clean.

However, I'm only a bot - so a human will still have to approve this request.

We already have a docker/ folder for the CI environments. Maybe you can put the Dockerfile in there as well?

added 3-Other label

The docker/ folder is for internal CI to build the docu. This Dockerfile is logically on the same level as bootstrap.sh (it builds the firmware), therefore I put it in main, instead of Documentation or such. But you could view it as a file to build the helper-container, which could go to Documentation, if you want to limit your main directory.

mentioned in commit f0d94559

I've manually merged this in commit f0d94559 ("feat(build): Add a Dockerfile for firmware building").

closed