Upcoming rewrite of git history

[facchinm]

Hi everyone
Since we are approaching a beta2 stage, we'd like to cleanup the repo before it's too late 🙂
To keep things "easy", we used to commit llext-edk and firmwares folders, and this creates a couple of problems, namely:

• need to keep in sync the code and the artifacts
• the repo gets bigger and bigger, with a lot of useless "mass rebuilds"

So we overhauled the CI and use it as an artifact provider! When #102 will be merged, every time we push to main, the compiled files will be uploaded to our servers, ready to be retrieved by a fancy utility in the exact expected status.

This will primarily benefit users who don't want to install the whole zephyr toolchain to just modify the core/library files, while the "hardcore" users will not see any change in their workflow (except a much cleaner git history 😉 )

The only drawback (@KurtE @mjs513) is that git pull will not sync anymore after the merge (if coming from an "uncleaned" core) so the core will need to be redownloaded 😞

[KurtE]

Maybe something like git stash will still allow you to get around this. I usually have run into this with the current stuff anyway as I
usually have stuff from the previous build_all

But I can also imagine we might need to do a fresh reload after this PR is done!