A temporal fix for RTX30s graphics card and cuda11 dependencies

[VegeWong]

TF 2.4.x-based dockerfile, which is required to work with the latest generation of NVIDIA graphics cards and CUDA 11. Also a temporal fix is attached for people with network issues accessing google-hosted repos and sources by introducing proxy related settings(the http_proxy, https_proxy and all_proxy commands).

ENV http_proxy http://127.0.0.1:8889
ENV https_proxy https://127.0.0.1:8889
ENV all_proxy http://127.0.0.1:8889
RUN git config --global http.proxy http://127.0.0.1:8889; wget https://github.com/grpc/grpc/archive/ac1c5de1b36da4a1e3d72ca40b0e43f24266121a.tar.gz

Note that it supposes users have an available http(s) proxy serving at port 8889 or users can simply forward their local proxy port by ssh -R [local_proxy_port]:localhost:8889 [server_address]:[server_port]

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[lespeholt]

I updated the repository to 2.4.1 and fixed both the Atari and DM Lab docker files. Unfortunately, we don't accept pull requests at the time for a number of reasons.