instruction: Create a Dockerfile for Node.js with production best practices
output: ```dockerfile
  from the.env file.Based on the value of API_ENDPOINT_BASE, the application routes requests either to the WireMock server (http://localhost:8080) or the AccuWeather API. In this setup, it uses the WireMock server.The code ensures that the ACCUWEATHER_API_KEY is required only if the application is not using WireMock, enhancing efficiency and avoiding errors.
  
  require("dotenv").config();
  
  const express = require("express");
  const axios = require("axios");
  
  const router = express.Router();
  const API_ENDPOINT_BASE = process.env.API_ENDPOINT_BASE;
  const API_KEY = process.env.ACCUWEATHER_API_KEY;
  
  console.log('API_ENDPOINT_BASE:', API_ENDPOINT_BASE); // Log after it's defined
  console.log('ACCUWEATHER_API_KEY is set:', !!API_KEY); // Log boolean instead of actual key
  
  if (!API_ENDPOINT_BASE) {
   throw new Error("API_ENDPOINT_BASE is not defined in environment variables");
  }
  
  // Only check for API key if not using WireMock
  if (API_ENDPOINT_BASE !== 'http://localhost:8080' && !API_KEY) {
   throw new Error("ACCUWEATHER_API_KEY is not defined in environment variables");
  }
  // Function to fetch the location key for the city
  async function fetchLocationKey(townName) {
   const { data: locationData } = await
  axios.get(`${API_ENDPOINT_BASE}/locations/v1/cities/search`, {
   params: { q: townName, details: false, apikey: API_KEY },
   });
   return locationData[0]?.Key;
  }Start the Node serverBefore you start the Node server, ensure that you have already installed the node packages listed in the package.json file by running npm install.
  
  npm install
  npm run start
  You should see the following output:
  
  > express-api-starter@1.2.0 start
  > node src/index.js
  
  API_ENDPOINT_BASE: http://localhost:8080
  ..
  Listening: http://localhost:5001The output indicates that your Node application has successfully started.
  Keep this terminal window open.Test the Mocked APIOpen a new terminal window and run the following command to test the mocked API:
  
  $ curl "http://localhost:5001/api/v1/getWeather?city=Bengaluru"
  You should see the following output:
  
  {"city":"Bengaluru","temperature":27.1,"conditions":"Mostly cloudy","forecasts":[{"date":"2024-09-02T07:00:00+05:30","temperature":83,"conditions":"Partly sunny w/ t-storms"},{"date":"2024-09-03T07:00:00+05:30","temperature":83,"conditions":"Thunderstorms"},{"date":"2024-09-04T07:00:00+05:30","temperature":83,"conditions":"Intermittent clouds"},{"date":"2024-09-05T07:00:00+05:30","temperature":82,"conditions":"Dreary"},{"date":"2024-09-06T07:00:00+05:30","temperature":82,"conditions":"Dreary"}]}%This indicates that your Node.js application is now successfully routing requests to the WireMock container and receiving the mocked responsesYou might have noticed that youâre trying to use http://localhost:5001 as the URL instead of port 8080. This is because your Node.js application is running on port 5001, and it's routing requests to the WireMock container that's listening on port 8080.
  TipBefore you proceed to the next step, ensure that you stop the node application service.<h2 class=scroll-mt-20 id=use-a-live-api-in-production-to-fetch-real-time-weather-data-
  ```