Add testing Dockerfile and Cloud Build configuration

.kokoro/docker/Dockerfile

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+# Copyright 2020 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.
+
+FROM ubuntu:16.04
+
+ENV DEBIAN_FRONTEND noninteractive
+
+# Ensure local Python is preferred over distribution Python.
+ENV PATH /usr/local/bin:$PATH
+
+# http://bugs.python.org/issue19846
+# At the moment, setting "LANG=C" on a Linux system fundamentally breaks
+# Python 3.
+ENV LANG C.UTF-8
+
+# Install dependencies.
+RUN apt-get update \
+  && apt-get install -y --no-install-recommends \
+    apt-transport-https \
+    build-essential \
+    ca-certificates \
+    curl \
+    git \
+    graphviz \
+    libbz2-dev \
+    libdb5.3-dev \
+    libexpat1-dev \
+    libffi-dev \
+    liblzma-dev \
+    libreadline-dev \
+    libsnappy-dev \
+    libssl-dev \
+    libsqlite3-dev \
+    portaudio19-dev \
+    redis-server \
+    software-properties-common \
+    ssh \
+    sudo \
+    tcl \
+    tcl-dev \
+    tk \
+    tk-dev \
+    uuid-dev \
+    wget \
+    zlib1g-dev \
+  && apt-get clean autoclean \
+  && apt-get autoremove -y \
+  && rm -rf /var/lib/apt/lists/* \
+  && rm -f /var/cache/apt/archives/*.deb
+
+# Install docker
+RUN curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+
+RUN add-apt-repository \
+   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
+   $(lsb_release -cs) \
+   stable"
+
+RUN apt-get update \
+  && apt-get install -y --no-install-recommends \
+    docker-ce \
+  && apt-get clean autoclean \
+  && apt-get autoremove -y \
+  && rm -rf /var/lib/apt/lists/* \
+  && rm -f /var/cache/apt/archives/*.deb
+
+# Install Microsoft ODBC 17 Driver and unixodbc for testing SQL Server samples
+RUN curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - \
+  && curl https://packages.microsoft.com/config/ubuntu/16.04/prod.list > /etc/apt/sources.list.d/mssql-release.list \
+  && apt-get update \
+  && ACCEPT_EULA=Y apt-get install -y --no-install-recommends \
+    msodbcsql17 \
+    unixodbc-dev \
+  && apt-get clean autoclean \
+  && apt-get autoremove -y \
+  && rm -rf /var/lib/apt/lists/* \
+  && rm -f /var/cache/apt/archives/*.deb
+
+# Install the desired versions of Python.
+RUN for PYTHON_VERSION in 2.7.17 3.6.9 3.7.5 3.8.0; do \
+  set -ex \
+    && wget --no-check-certificate -O python-${PYTHON_VERSION}.tar.xz "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz" \
+    && wget --no-check-certificate -O python-${PYTHON_VERSION}.tar.xz.asc "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz.asc" \
+    && export GNUPGHOME="$(mktemp -d)" \
+    && gpg --keyserver ha.pool.sks-keyservers.net --recv-keys \
+      # 2.7.17 (Benjamin Peterson)
+      C01E1CAD5EA2C4F0B8E3571504C367C218ADD4FF \
+      # 3.4.10, 3.5.9 (Larry Hastings)
+      97FC712E4C024BBEA48A61ED3A5CA953F73C700D \
+      # 3.6.9, 3.7.5 (Ned Deily)
+      0D96DF4D4110E5C43FBFB17F2D347EA6AA65421D \
+      # 3.8.0 (Łukasz Langa)
+      E3FF2839C048B25C084DEBE9B26995E310250568 \
+    && gpg --batch --verify python-${PYTHON_VERSION}.tar.xz.asc python-${PYTHON_VERSION}.tar.xz \
+    && rm -r "$GNUPGHOME" python-${PYTHON_VERSION}.tar.xz.asc \
+    && mkdir -p /usr/src/python-${PYTHON_VERSION} \
+    && tar -xJC /usr/src/python-${PYTHON_VERSION} --strip-components=1 -f python-${PYTHON_VERSION}.tar.xz \
+    && rm python-${PYTHON_VERSION}.tar.xz \
+    && cd /usr/src/python-${PYTHON_VERSION} \
+    && ./configure \
+        --enable-shared \
+      # This works only on Python 2.7 and throws a warning on every other
+      # version, but seems otherwise harmless.
+        --enable-unicode=ucs4 \
+        --with-system-ffi \
+        --without-ensurepip \
+    && make -j$(nproc) \
+    && make install \
+    && ldconfig \
+  ; done \
+  && rm -rf /usr/src/python* \
+  && rm -rf ~/.cache/
+
+
+# Install pip on Python 3.6 only.
+# If the environment variable is called "PIP_VERSION", pip explodes with
+# "ValueError: invalid truth value '<VERSION>'"
+ENV PYTHON_PIP_VERSION 10.0.1
+RUN wget --no-check-certificate -O /tmp/get-pip.py 'https://bootstrap.pypa.io/get-pip.py' \
+    && python3.6 /tmp/get-pip.py "pip==$PYTHON_PIP_VERSION" \
+  # we use "--force-reinstall" for the case where the version of pip we're trying to install is the same as the version bundled with Python
+  # ("Requirement already up-to-date: pip==8.1.2 in /usr/local/lib/python3.6/site-packages")
+  # https://github.com/docker-library/python/pull/143#issuecomment-241032683
+    && pip3 install --no-cache-dir --upgrade --force-reinstall "pip==$PYTHON_PIP_VERSION" \
+  # then we use "pip list" to ensure we don't have more than one pip version installed
+  # https://github.com/docker-library/python/pull/100
+    && [ "$(pip list |tac|tac| awk -F '[ ()]+' '$1 == "pip" { print $2; exit }')" = "$PYTHON_PIP_VERSION" ]
+
+# Ensure Pip for 3.8.0
+RUN python3.8 /tmp/get-pip.py
+RUN rm /tmp/get-pip.py
+
+# Install "virtualenv", since the vast majority of users of this image
+# will want it.
+RUN pip install --no-cache-dir virtualenv
+
+# Setup Cloud SDK
+ENV CLOUD_SDK_VERSION 272.0.0
+# Use system python for cloud sdk.
+ENV CLOUDSDK_PYTHON python3.6
+RUN wget https://dl.google.com/dl/cloudsdk/channels/rapid/downloads/google-cloud-sdk-$CLOUD_SDK_VERSION-linux-x86_64.tar.gz
+RUN tar xzf google-cloud-sdk-$CLOUD_SDK_VERSION-linux-x86_64.tar.gz
+RUN /google-cloud-sdk/install.sh
+ENV PATH /google-cloud-sdk/bin:$PATH
+
+# Enable redis-server on boot.
+RUN sudo systemctl enable redis-server.service
+
+CMD ["python3.6"]

.kokoro/docker/cloudbuild.yaml

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+# Copyright 2020 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
+
+steps:
+    - name: 'gcr.io/cloud-builders/docker'
+      args: ['build', '-t', 'gcr.io/$PROJECT_ID/python-samples-testing-docker', '.']
+      dir: '.kokoro/docker'
+images:
+     - 'gcr.io/$PROJECT_ID/python-samples-testing-docker'