Build dlib as downloadable artifacts

[derneuere]

In order to improve the speed of the build pipeline and reduce build dependencies, it would be great to create new Dockerfiles that would build dlib and faiss for arm64 and x64 and return as an artifact the binaries.

Then we can simplify the build pipeline by just downloading the artifacts, which would speed up the build pipeline by around two and a half hours.

I already started it and the Dockerfiles can be found in dependencies/dlib

[derneuere]

faiss is now available as arm64. we now only need to build dlib.