新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch21/docker-images/serverless-cli/Dockerfile

@@ -0,0 +1,15 @@
+FROM node:12
+
+ENV SERVERLESS_VERSION="1.77.1" \
+    KUBERNETES_VERSION="1.18.5" 
+
+RUN npm install -g serverless@${SERVERLESS_VERSION}
+
+RUN curl -LO https://storage.googleapis.com/kubernetes-release/release/v${KUBERNETES_VERSION}/bin/linux/amd64/kubectl && \
+    chmod +x kubectl && \
+    mv kubectl /usr/local/bin/
+
+COPY start.sh /
+RUN chmod +x /start.sh
+CMD /start.sh
+WORKDIR /kiamol