Only enable numba mvc on GPU image

Author: djherbis

Dockerfile.tmpl

@@ -254,9 +254,11 @@ RUN pip install scipy \
     apt-get install -y pandoc && \
     pip install essentia
 
+{{ if eq .Accelerator "gpu" }}
 # #1281 Install numba MVC support:
 RUN pip install ptxcompiler-cu11 cubinlinker-cu11 --extra-index-url=https://pypi.nvidia.com
 ENV NUMBA_CUDA_ENABLE_MINOR_VERSION_COMPATIBILITY=1
+{{ end }}
 
 RUN apt-get install -y git-lfs && \
     /tmp/clean-layer.sh