Split CUDA version env variable into major/minor components

Can now be used to determine both CUDA_PKG_VERSION and CUDACXX location

Author: rtburns-jpl

tools/imagesets/oracle8conda/dev/Dockerfile

@@ -20,4 +20,4 @@ RUN conda install --yes --file /tmp/spec-file.txt \
  && rm /tmp/spec-file.txt
 
 ENV CUDAHOSTCXX=x86_64-conda_cos6-linux-gnu-g++
-ENV CUDACXX=/usr/local/cuda-11.0/bin/nvcc
+ENV CUDACXX=/usr/local/cuda-${CUDA_VERSION_MAJOR}.${CUDA_VERSION_MINOR}/bin/nvcc

tools/imagesets/oracle8conda/runtime/Dockerfile

@@ -31,7 +31,9 @@ ENV GDAL_DRIVER_PATH=$conda_prefix/lib/gdalplugins
 ENV PROJ_LIB=$conda_prefix/share/proj
 ENV MPLCONFIGDIR=/tmp
 
-ENV CUDA_PKG_VERSION 11-0
+ENV CUDA_VERSION_MAJOR 11
+ENV CUDA_VERSION_MINOR 0
+ENV CUDA_PKG_VERSION "${CUDA_VERSION_MAJOR}-${CUDA_VERSION_MINOR}"
 
 RUN yum install -y \
         cuda-cudart-$CUDA_PKG_VERSION \