fix: remove trailing backslash (#60)

* feat: add REPO/BRANCH build args for llama.cpp

- Introduce ARG REPO and ARG BRANCH to replace the hardcoded git clone with: `git clone -b ${BRANCH} --single-branch --recursive ${REPO}` . This allows overriding the llama.cpp repository and branch at build time via `--build-arg`.

- Update `docs/building.md` to recommend using `--build-arg` instead of updating the file

* fix: remove trailing backslash

toolboxes/Dockerfile.rocm-6.4.4

@@ -13,7 +13,7 @@ RUN dnf -y --nodocs --setopt=install_weak_deps=False \
 WORKDIR /opt/llama.cpp
 ARG REPO=https://github.com/ggerganov/llama.cpp.git
 ARG BRANCH=master
-RUN git clone -b ${BRANCH} --single-branch --recursive ${REPO} . \
+RUN git clone -b ${BRANCH} --single-branch --recursive ${REPO} .
 
 # build + install
 RUN git clean -xdf \