Update Dockerfile

Dockerfile

@@ -2,6 +2,9 @@
 FROM node:latest 
 
 # 清理缓存
+USER root 
+RUN apt-get update && \
+    apt-get install -y iputils-ping && \
 RUN npm cache clean --force  
 
 # 安装 Node-RED 
@@ -14,7 +17,7 @@ COPY settings.js  /usr/src/node-red/settings.js
 COPY flows.json  /usr/src/node-red/flows.json  
 
 # 安装节点
-RUN npm install -g node-red-node-email
+RUN npm install -g node-red-node-email node-red-node-ping 
 
 # 启动 Node-RED 
 CMD ["node-red", "--userDir", "/usr/src/node-red"]