Add ci scripts (#1)

* Add ci scripts

* Move config files to ci/kokoro/docker

* Remove dump-logs etc

* Simplified grpc installation

* Add Ubuntu 16.04 kokoro config

* Address code review

ci/kokoro/Dockerfile.centos

@@ -0,0 +1,51 @@
+# Copyright 2019 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.
+
+ARG DISTRO_VERSION=7
+FROM centos:${DISTRO_VERSION}
+
+# Add /usr/local/lib
+
+# Search paths tweak for the build
+ENV PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:/usr/local/lib64/pkgconfig
+ENV LD_LIBRARY_PATH=/usr/local/lib:/usr/local/lib64
+ENV PATH=/usr/local/bin:${PATH}
+
+# First install the development tools and OpenSSL. The development tools
+# distributed with CentOS (notably CMake) are too old to build
+# `google-cloud-cpp`. In these instructions, we use `cmake3` obtained from
+# [Software Collections](https://www.softwarecollections.org/).
+
+RUN rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
+RUN yum install -y centos-release-scl
+RUN yum-config-manager --enable rhel-server-rhscl-7-rpms
+RUN yum makecache && \
+    yum install -y automake cmake3 curl-devel gcc gcc-c++ git libtool \
+        make openssl-devel pkgconfig tar wget which zlib-devel
+RUN ln -sf /usr/bin/cmake3 /usr/bin/cmake && ln -sf /usr/bin/ctest3 /usr/bin/ctest
+
+# Install c-ares
+RUN mkdir -p /var/tmp/Downloads; \
+    cd /var/tmp/Downloads; \
+    wget -q https://github.com/c-ares/c-ares/archive/cares-1_15_0.tar.gz; \
+    tar -xf cares-1_15_0.tar.gz; \
+    cd /var/tmp/Downloads/c-ares-cares-1_15_0; \
+    ./buildconf && ./configure && make -j $(nproc); \
+    make install; \
+    ldconfig
+
+# Install grpc from source
+WORKDIR /var/tmp/ci
+COPY install-grpc.sh /var/tmp/ci
+RUN /var/tmp/ci/install-grpc.sh