Backport the stable doc build on v1.0.1 to master (#16503)
Summary:
List of changes:
- Always push the final state of the doc build docker for debugging purposes.
- Adds code for the stable doc build. This code is never actually run on master, only the v1.0.1 branch. There is a big note for this behavior.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16503
Differential Revision: D13972469
Pulled By: zou3519
fbshipit-source-id: 68f459650ef0de200a34edd43fc1372143923972
