@java.lang.Override
      public com.google.protobuf.ByteString getServiceAccountBytes() {
        java.lang.Object ref = serviceAccount_;
        if (ref instanceof java.lang.String) {
          com.google.protobuf.ByteString b =
              com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
          serviceAccount_ = b;
          return b;
        } else {
          return (com.google.protobuf.ByteString) ref;
        }
      }
<pre>
Optional. The email address of the service account for Cloud
Workstations VMs created with this configuration. When specified, be
sure that the service account has `logginglogEntries.create` permission
on the project so it can write logs out to Cloud Logging. If using a
custom container image, the service account must have permissions to
pull the specified image.

If you as the administrator want to be able to `ssh` into the
underlying VM, you need to set this value to a service account
for which you have the `iam.serviceAccounts.actAs` permission.
Conversely, if you don't want anyone to be able to `ssh` into the
underlying VM, use a service account where no one has that
permission.

If not set, VMs run with a service account provided by the
Cloud Workstations service, and the image must be publicly
accessible.
</pre>

<code>string service_account = 2 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The bytes for serviceAccount.
java-workstations/proto-google-cloud-workstations-v1beta/src/main/java/com/google/cloud/workstations/v1beta/WorkstationConfig.java