ci : fix docker build number and tag name

[ngxson]

Motivation

Currently, docker build (both from CI and locally via docker build) outputs build 0 when asking with --version

# docker run --rm ghcr.io/ggerganov/llama.cpp:server --version
version: 0 (unknown)
built with cc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0 for x86_64-linux-gnu

This is due to .git being included inside .dockerignore, which make the directory not being copied into docker build context.

The CI also have a problem where tag name becomes :full-cuda--b1-1e43630, while ideally it should be something like :full-cuda-b1234

In this PR

• Remove .git from .dockerignore
• For CI, each build on master branch will now have 2 tags:
  • :${{ matrix.config.tag }} --> example: :full-cuda
  • :${{ matrix.config.tag }}-b${BUILD_NUMBER} --> example: :full-cuda-b1234

Test

For testing purpose, I created a cloned repo: https://github.com/ngxson/llama.cpp-fix-ci/pkgs/container/llama.cpp-fix-ci/versions

For testing locally:

docker build -f ./.devops/llama-server.Dockerfile .
docker run --rm llamacpptest --version
# version: 3830 (6513c323)

---

• I have read the contributing guidelines
• Self-reported review complexity:
  • Low

[ngxson]

@ggerganov Small explanation for this: This allow disabling global write access for GITHUB_TOKEN on CI (image below)

However, some other workflows don't support this yet (for example, build.yml), so let's keep the read-write setting for now. I'll do a follow-up PR for fixing it.