update readme

files/image_refresh/Dockerfile

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+# Use an official Node runtime as a parent image
+FROM node:14
+
+# Create and change to the app directory
+WORKDIR /usr/src/app
+
+# Copy package.json and package-lock.json
+COPY package*.json ./
+
+# Install any needed packages specified in package.json
+RUN npm install
+
+# Bundle app source inside Docker container
+COPY . .
+
+# Make port 3000 available to the world outside this container
+EXPOSE 3000
+
+# Define environment variable
+ENV NAME World
+
+# Run app.py when the container launches
+CMD ["node", "server.js"]

files/image_refresh/package.json

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+{
+  "name": "docker_web_app",
+  "version": "1.0.0",
+  "description": "A simple Docker Web app",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "express": "^4.17.1"
+  }
+}

files/image_refresh/server.js

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+const express = require('express');
+const fs = require('fs');
+const path = require('path');
+const app = express();
+const port = 3000;
+
+app.use(express.static('public')); // Serve static files from the 'public' directory
+
+// Endpoint to get the most recent image
+app.get('/most-recent-image', (req, res) => {
+    const imagesDirectory = path.join(__dirname, 'images');
+    fs.readdir(imagesDirectory, (err, files) => {
+        if (err) {
+            return res.status(500).send('Unable to scan directory');
+        }
+        let mostRecentImage = null;
+        let maxDate = Date.now();
+        files.forEach(file => {
+            const filePath = path.join(imagesDirectory, file);
+            const stats = fs.statSync(filePath);
+            if (stats.isFile() && /\.(jpg|jpeg|png|gif)$/i.test(file)) {
+                const currentDate = new Date(stats.mtime).getTime();
+                if (currentDate < maxDate) {
+                    mostRecentImage = file;
+                    maxDate = currentDate;
+                }
+            }
+        });
+        if (mostRecentImage) {
+            res.json({ imagePath: `/images/${mostRecentImage}` });
+        } else {
+            res.status(404).send('No images found');
+        }
+    });
+});
+
+app.listen(port, () => {
+    console.log(`Server running at http://localhost:${port}`);
+});