chore: migrate library generation IT to cloud build

Author: JoeWang1127

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

@@ -0,0 +1,36 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+timeout: 7200s # 2 hours
+substitutions:
+  _TEST_IMAGE_NAME: "test-image:latest"
+steps:
+- name: gcr.io/cloud-builders/docker
+  args: [
+    "build",
+    "-t", "${_TEST_IMAGE_NAME}",
+    "--file", ".cloudbuild/library_generation/library_generation.Dockerfile",
+    "."
+  ]
+  id: library-generation-build
+  waitFor: ["-"]
+  env:
+  - 'DOCKER_BUILDKIT=1'
+
+- name: test-image:latest
+  waitFor: ["library-generation-build"]
+  id: library-generation-integration-test
+
+options:
+  logging: CLOUD_LOGGING_ONLY