add test enviroment images

docker/test_env/Dockerfile

+FROM python:3.6.8-jessie
+
+RUN apt-get update && apt-get install -y --no-install-recommends wget apt-transport-https && \
+    wget -qO- "https://get.helm.sh/helm-v3.0.2-linux-amd64.tar.gz" | tar --strip-components=1 -xz -C /usr/local/bin linux-amd64/helm && \
+    sh -c 'echo deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main > /etc/apt/sources.list.d/kubernetes.list' && \
+    apt-get update && apt-get install -y --no-install-recommends \
+    build-essential kubectl && \
+    apt-get remove --purge -y
+
+COPY docker-entrypoint.sh /app/docker-entrypoint.sh
+WORKDIR /root
+
+ENTRYPOINT [ "/app/docker-entrypoint.sh" ]
+CMD [ "start" ]

docker/test_env/docker-entrypoint.sh

+#!/bin/bash
+
+set -e
+
+if [ "$1" = 'start' ]; then
+   tail -f /dev/null
+fi
+
+exec "$@"
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