ci(cuda): limit parallel jobs to avoid OOM during CUDA build

Signed-off-by: Dorin Geman <dorin.geman@docker.com>

Author: doringeman

llamacpp/native/cuda.Dockerfile

@@ -37,7 +37,7 @@ RUN echo "-B build \
     -GNinja \
     -S ." > cmake-flags
 RUN cmake $(cat cmake-flags)
-RUN cmake --build build --config Release
+RUN cmake --build build --config Release -j$(nproc --ignore=2)
 RUN cmake --install build --config Release --prefix install
 
 RUN rm install/bin/*.py