update dockerfile to support Nsight install on arm platforms

Signed-off-by: Ananth Subramaniam <ansubramania@nvidia.com>

Author: ananthsub

docker/Dockerfile

@@ -45,7 +45,7 @@ apt-get install -y --no-install-recommends \
 # Nsight
 apt install -y --no-install-recommends gnupg
 echo "deb http://developer.download.nvidia.com/devtools/repos/ubuntu$(source /etc/lsb-release; echo "$DISTRIB_RELEASE" | tr -d .)/$(dpkg --print-architecture) /" | tee /etc/apt/sources.list.d/nvidia-devtools.list
-apt-key adv --fetch-keys http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/x86_64/7fa2af80.pub
+apt-key adv --fetch-keys http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/$(uname -m | sed 's/aarch64/sbsa/')/7fa2af80.pub
 apt update
 apt install -y nsight-systems-cli