ci: avoid cuda docker build timeout by using -j16

Author: leejet

Dockerfile.cuda

@@ -11,7 +11,7 @@ COPY . .
 
 ARG CUDACXX=/usr/local/cuda/bin/nvcc
 RUN cmake . -B ./build -DSD_CUDA=ON
-RUN cmake --build ./build --config Release --parallel
+RUN cmake --build ./build --config Release -j$(nproc)
 
 FROM nvidia/cuda:${CUDA_VERSION}-cudnn-runtime-ubuntu${UBUNTU_VERSION} AS runtime