Cloud Build - July 27th, 2021 [Feature]

## Feature Cloud Build private pools are now [generally available](https://cloud.google.com/products/#product-launch-stages). Private pools offer [regionalization](https://cloud.google.com/build/docs/locations) and greater customization over the build environment, including the ability to access resources in a private network with [support for VPC Service Controls](https://cloud.google.com/build/docs/private-pools/using-vpc-service-controls). For more information, see [Private pools overview](https://cloud.google.com/build/docs/private-pools/private-pools-overview).