Add focal-based nvidia docker image
This MR adds focal-based nvidia support images.
Compared to 16.04 nvidia image Dockerfile, I removed the following line:
COPY --from=nvidia /etc/ld.so.conf.d/glvnd.conf /etc/ld.so.conf.d/glvnd.conf
The file /etc/ld.so.conf.d/glvnd.conf
is not existent in nvidia/opengl:1.0-glvnd-runtime-ubuntu20.04
anymore.
Contributes to clickable#277 (closed).
Edited by Jonatan Hatakeyama Zeidler