Populate download.pytorch.org IP to container (#100475)
Follow up after https://github.com/pytorch/pytorch/pull/100436 to disable download.pytorch.org access over ipv6 access problems.
Why not copy `/etc/hosts` from host to the container? Because it would break container ip resolution in distributed tests, that relies on `socket.gethostbyname(socket.gethostname())` to work.
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### <samp>🤖 Generated by Copilot at 756d0b1</samp>
Propagate `download.pytorch.org` IP address to docker containers in `test-pytorch-binary` action and workflow. This fixes DNS issues when downloading PyTorch binaries inside the containers.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/100475
Approved by: https://github.com/huydhn
