update test enviroment images Dockerfile

docker/test_env/Dockerfile

@@ -2,6 +2,8 @@ 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 && \
+    wget -P /tmp https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg && \
+    apt-key add /tmp/apt-key.gpg && \
     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 && \