also install nvidia-utils

[h-vetinari]

The changes in #83 caused nvidia-smi to not be present in the image anymore (logs):

 │ │ $SRC_DIR/conda_build.sh: line 9: nvidia-smi: command not found

Reading the docs referenced by #83

open-gpu-server/vm-images/elements/cuda/post-install.d/05-cuda-install

Line 36 in fa27a2f

# See: https://documentation.ubuntu.com/server/how-to/graphics/install-nvidia-drivers/

more closely, they say

Let’s assume we want to install the 535-server driver (listed as nvidia-driver-535-server):

sudo ubuntu-drivers install --gpgpu nvidia:535-server

You will also want to install the following additional components:

sudo apt install nvidia-utils-535-server

So let's add the utils package as well.