Update Dockerfile

Without NVIDIA GPG Key update, it throws out an error : " W: GPG error: https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/x86_64  InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A4B469963BF863CC
E: The repository 'https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/x86_64  InRelease' is not signed.
"

Author: mohammedshafeeqet

docs/Dockerfile

@@ -1,5 +1,8 @@
 FROM nvidia/cuda:10.1-base
 
+#Nvidia Public GPG Key
+RUN apt-key adv --fetch-keys https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/x86_64/3bf863cc.pub
+
 RUN apt update && apt install -y wget unzip curl bzip2 git
 RUN curl -LO http://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh
 RUN bash Miniconda3-latest-Linux-x86_64.sh -p /miniconda -b