assume yes

Author: JoeWang1127

.cloudbuild/library_generation/cloudbuild-library-generation-integration-test.yaml

@@ -36,7 +36,7 @@ steps:
     - "-c"
     - |
       apt-get update
-      apt-get install maven
+      apt-get -y install maven
       pip install --upgrade pip
       pip install --require-hashes -r hermetic_build/common/requirements.txt
       pip install hermetic_build/common