Add a ci/no-build label (#58778)
Summary:
Depends on https://github.com/pytorch/pytorch-probot/pull/22. Adds a new label called `ci/no-build` that disables the CircleCI `build` workflow on PRs. The current behavior should be the same in the absence of `ci/no-build`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/58778
Reviewed By: malfet
Differential Revision: D28615349
Pulled By: samestep
fbshipit-source-id: 1ed521761ca4ffa32db954a51918f693beddb3f3
