Add Cloud Build for presubmit test (#4)

cloud_build/Dockerfile

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+# This Dockerfile creates an image for running presubmit tests.
+
+FROM gcr.io/cloud-builders/gcloud
+
+# Copy everything into the container
+COPY . /dataproc-custom-images/
+RUN ls -a /dataproc-custom-images
+
+ENTRYPOINT ["bash", "/dataproc-custom-images/cloud_build/presubmit.sh"]

cloud_build/cloudbuild.yaml

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+steps:
+# 1. Create a Docker image containing dataproc-custom-images repo
+- name: 'gcr.io/cloud-builders/docker'
+  args: ['build', '--tag=gcr.io/google.com/cloud-dataproc-ci/dataproc-custom-images-presubmit', '-f', 'cloud_build/Dockerfile', '.']
+# 2. Run presumit tests
+- name: 'gcr.io/google.com/cloud-dataproc-ci/dataproc-custom-images-presubmit'
+  entrypoint: 'bash'
+  args: ['/dataproc-custom-images/cloud_build/presubmit.sh']

cloud_build/presubmit.sh

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+#!/bin/bash
+
+# Copyright 2019 Google Inc. All Rights Reserved.
+#
+# 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.
+
+cd /dataproc-custom-images
+
+# Run all tests
+python2 -m unittest discover