Add Github action to upload full source releases (#63022)
Summary:
Those release tarballs include the submodules.
The action is run on every tag, master-branch push but will not upload anything.
This makes sure nothing is broken when an actual release happens.
On created releases the action runs and uploads the tarball
Fixes https://github.com/pytorch/pytorch/issues/62708
As I don't have access rights here and testing is obviously hard (as a new release needs to be published), I set up a test at https://github.com/Flamefire/pytorch/releases/tag/testtag
See also the run(s) at https://github.com/Flamefire/pytorch/actions/workflows/create_release.yml
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63022
Reviewed By: saketh-are
Differential Revision: D30256253
Pulled By: seemethere
fbshipit-source-id: ab5fe131452de14ae3768b91c221e68c536cb3aa
