serviceAccount property
Optional. The service account that Cloud Build uses to run the build.
This field is only applicable when worker_pool is specified (i.e., for
custom worker pools). If worker_pool is not specified, this field is
ignored and the build runs using the Google-managed service agent.
Format: projects/{project}/serviceAccounts/{service_account} or
{service_account}@{project}.iam.gserviceaccount.com
Implementation
final String serviceAccount;