Run Ruby xDS tests on Buster instead of Jessie (#25496)

Don't try to install pip2

templates/tools/dockerfile/test/ruby_buster_x64/Dockerfile.template

@@ -0,0 +1,38 @@
+%YAML 1.2
+--- |
+  # Copyright 2021 The gRPC authors.
+  #
+  # 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 debian:buster
+  
+  <%include file="../../apt_get_basic.include"/>
+
+
+  RUN apt-get update && apt-get install -y ${'\\'}
+      python-all-dev ${'\\'}
+      python3-all-dev ${'\\'}
+      python-setuptools ${'\\'}
+      procps
+  
+  # Install Python packages from PyPI
+  RUN curl https://bootstrap.pypa.io/get-pip.py | python3
+  RUN pip install --upgrade pip==19.3.1
+  RUN pip install virtualenv==16.7.9
+  RUN pip install protobuf==3.5.2.post1 twisted==17.5.0
+
+  <%include file="../../gcp_api_libraries.include"/>
+  <%include file="../../ruby_deps.include"/>
+  <%include file="../../run_tests_addons.include"/>
+  # Define the default command.
+  CMD ["bash"]

tools/dockerfile/test/ruby_buster_x64/Dockerfile

@@ -0,0 +1,89 @@
+# Copyright 2021 The gRPC authors.
+#
+# 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 debian:buster
+
+# Install Git and basic packages.
+RUN apt-get update && apt-get install -y \
+  autoconf \
+  autotools-dev \
+  build-essential \
+  bzip2 \
+  ccache \
+  curl \
+  dnsutils \
+  gcc \
+  gcc-multilib \
+  git \
+  golang \
+  gyp \
+  lcov \
+  libc6 \
+  libc6-dbg \
+  libc6-dev \
+  libgtest-dev \
+  libtool \
+  make \
+  perl \
+  strace \
+  python-dev \
+  python-setuptools \
+  python-yaml \
+  telnet \
+  unzip \
+  wget \
+  zip && apt-get clean
+
+#================
+# Build profiling
+RUN apt-get update && apt-get install -y time && apt-get clean
+
+
+
+RUN apt-get update && apt-get install -y \
+    python-all-dev \
+    python3-all-dev \
+    python-setuptools \
+    procps
+
+# Install Python packages from PyPI
+RUN curl https://bootstrap.pypa.io/get-pip.py | python3
+RUN pip install --upgrade pip==19.3.1
+RUN pip install virtualenv==16.7.9
+RUN pip install protobuf==3.5.2.post1 twisted==17.5.0
+
+# Google Cloud platform API libraries
+RUN pip install --upgrade google-api-python-client oauth2client
+
+#==================
+# Ruby dependencies
+
+# Install rvm
+RUN apt-get update && apt-get install -y gnupg2
+RUN gpg2 --keyserver hkp://pool.sks-keyservers.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
+RUN \curl -sSL https://get.rvm.io | bash -s stable
+
+# Install Ruby 2.5
+RUN /bin/bash -l -c "rvm install ruby-2.5"
+RUN /bin/bash -l -c "rvm use --default ruby-2.5"
+RUN /bin/bash -l -c "echo 'gem: --no-document' > ~/.gemrc"
+RUN /bin/bash -l -c "echo 'export PATH=/usr/local/rvm/bin:$PATH' >> ~/.bashrc"
+RUN /bin/bash -l -c "echo 'rvm --default use ruby-2.5' >> ~/.bashrc"
+RUN /bin/bash -l -c "gem install bundler --no-document -v 1.9"
+
+
+RUN mkdir /var/local/jenkins
+
+# Define the default command.
+CMD ["bash"]

tools/internal_ci/linux/grpc_xds_ruby.sh

@@ -20,7 +20,7 @@ cd $(dirname $0)/../../..
 
 source tools/internal_ci/helper_scripts/prepare_build_linux_rc
 
-export DOCKERFILE_DIR=tools/dockerfile/test/ruby_jessie_x64
+export DOCKERFILE_DIR=tools/dockerfile/test/ruby_buster_x64
 export DOCKER_RUN_SCRIPT=tools/internal_ci/linux/grpc_xds_ruby_test_in_docker.sh
 export OUTPUT_DIR=reports
 exec tools/run_tests/dockerize/build_and_run_docker.sh