xla

f076b3fe - Add Terraform config with CloudBuild triggers for building docker images and wheels (#4604)

Add Terraform config with CloudBuild triggers for building docker images and wheels (#4604) This PR adds pieces missing from https://github.com/pytorch/xla/pull/4531. This Terraform setup provisions: public storage bucket for PyTorch and PyTorch/XLA wheels. private storage bucket for Terraform state. public artifact repository for docker images. cloud builds for nightly and release docker images and wheels. schedule jobs and a service account for triggering cloud build. This setup provisions resource in the tpu-pytorch project, but appends suffix "-staging" to many resources to distinguish them. It doesn't reuse / import any existing resources.