Google Cloud Build is a serverless CI/CD platform from Google Cloud. It runs build steps in containers so that teams can build, test and deploy software without administering their own build servers. Builds are started through triggers or manually, and private pools allow them to run in an isolated network environment. The service is delivered only as a cloud service and belongs to the Google Cloud platform.
Google LLC is part of Alphabet Inc., which is headquartered in the United States, so the service is subject to US law such as the CLOUD Act. Users choose the region in which a build runs; several European regions are available, including Finland, Belgium, Frankfurt, the Netherlands, Paris and Zurich. According to the documentation, regional endpoints guarantee data residency for data at rest and in transit, excluding resource metadata. Google offers a Cloud Data Processing Addendum under which Google acts as processor. A European organisation can therefore keep build data within Europe, but remains dependent on a US provider.