Add pybind11 to the mlir-nvidia Docker image to be able to enable the MLIR Python bindings

[stellaraccident]

Thanks!

[kuhnel]

Looking at the documentation, it seems like we also need to modify the cmake command line parameters: https://mlir.llvm.org/docs/Bindings/Python/

I suppose this would be second change once the new Container is deployed?

[stellaraccident]

Yes, we'll update the parameters once the container is ready.

I also need to figure out how to get the windows container set up with this
depend. I'll ping you about that separately (still a patch outstanding to
finish the windows support).

buildbot/google/docker/buildbot-mlir-nvidia/Dockerfile

 # Use the image from NVIDIA as base
 FROM nvidia/cuda:10.2-base-ubuntu18.04
 
 
 # install build tools
 RUN apt-get update; \
     apt-get install -y software-properties-common apt-transport-https ca-certificates \
       clang-8 lld-8 ninja-build git wget gnupg ccache \
-      python python-pip python-psutil ;\
+      python python-pip python-psutil pybind11-dev ;\
     update-alternatives --install /usr/bin/clang clang /usr/bin/clang-8 100 ;\
     update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-8 100 ;\
     update-alternatives --install /usr/bin/lld lld /usr/bin/lld-8 100
 
 # install cuda
 # avoid popups for keyboard configurations
 RUN DEBIAN_FRONTEND=noninteractive apt-get install -y cuda