[WIP] feat: build llama cpp externally

[mudler]

Description

This PR fixes #

Notes for Reviewers

Signed commits

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[richiejp]

So a completely separate Dockerfile and Makefile? This will be a major improvement!

[mudler]

So a completely separate Dockerfile and Makefile? This will be a major improvement!

yup! my plan is to isolate everything, one backend at a time. Currently the llama.cpp one is the most heavy, having also lots of specific code in the golang part - ideally I want to get rid of all of the specific llama.cpp code and the binary bundling bits out of the main code.

This is how I'm testing things now with #5816 in:

docker build --build-arg BACKEND=llama-cpp -t llama-cpp-backend -f backend/Dockerfile.llama-cpp .
docker save llama-cpp-backend -o llama-backend.tar
local-ai backends install "ocifile://$PWD/llama-backend.tar"