Add workflow and scripts to build torchbench nightly docker (#1588)
Summary:
Build nightly docker to deploy it in PR CI and A100 userbenchmark CI.
Part of https://github.com/pytorch/benchmark/issues/1590
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1588
Reviewed By: malfet
Differential Revision: D45362122
Pulled By: xuzhao9
fbshipit-source-id: 9972e3ab153fce9b4225bbe862d5734bf9211fd8