copy from does not support interpolation; per https://forums.docker.c…

…om/t/how-can-i-expand-a-variable-within-a-copy-command-in-the-dockerfile/113538/7 use multistage build

Dockerfile

@@ -1,10 +1,11 @@
 
 # obtain from: https://catalog.ngc.nvidia.com/orgs/nvidia/containers/cuda/tags
 ARG NVCR_CUDA=nvcr.io/nvidia/cuda:11.8.0-devel-ubuntu20.04
+FROM ${NVCR_CUDA} as cuda
 
 FROM ucsdets/scipy-ml-notebook:2023.2-stable
 
-COPY --from=$NVCR_CUDA /usr/local/cuda-11.8 /usr/local/cuda-11.8
+COPY --from=cuda /usr/local/cuda-11.8 /usr/local/cuda-11.8
 
 USER root
 RUN ln -s cuda-11.8 /usr/local/cuda && ln -s cuda-11.8 /usr/local/cuda-11