[CI] Install required keys to fix NV container build problem (#6079)

* [CI] Install required keys to fix NV container build problem

Error:
The following signatures couldn't be verified because the public key is
not available: NO_PUBKEY A4B469963BF863CC

See https://forums.developer.nvidia.com/t/invalid-public-key-for-cuda-apt-repository/212901

Author: Pavel Chupin

devops/containers/ubuntu2004_build.Dockerfile

@@ -4,6 +4,10 @@ ENV DEBIAN_FRONTEND=noninteractive
 
 USER root
 
+# Install Nvidia keys
+# https://forums.developer.nvidia.com/t/notice-cuda-linux-repository-key-rotation/212772
+RUN apt-key adv --fetch-keys https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/3bf863cc.pub
+
 # Install SYCL prerequisites
 COPY scripts/install_build_tools.sh /install.sh
 RUN /install.sh