use ubuntu

Author: JoeWang1127

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

@@ -98,11 +98,14 @@ steps:
     "prepare-golden"
   ]
 
-- name: python:3.13.1-alpine3.21
-  entrypoint: python
+- name: ubuntu:24.04
+  entrypoint: bash
   args:
-  - "-m"
+  - "-c"
   - |
+    apt-get update && apt-get install -y python3 python3.12-venv
+    python3 -m venv .venv
+    source .venv/bin/activate
     pip install --require-hashes -r .cloudbuild/library_generation/scripts/requirements.txt
     python -m unittest .cloudbuild/library_generation/scripts/integration_tests_cloud_build.py
   id: verify-generation