.github - add pytorch dev infra team as codeowner (#78134)
@pytorch/pytorch-dev-infra should be a codeowner, to my understanding.
Trigger for this: we should get tagged on XLA PRs.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/78134
Approved by: https://github.com/osalpekar, https://github.com/seemethere
