📝 Added sandbox (code sketchbook)

sandbox/docker_web_app/.dockerignore

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+node_modules
+npm-debug.log

sandbox/docker_web_app/.prettierrc

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+trailingComma: "all"
+tabWidth: 4
+semi: false
+singleQuote: true
+bracketSpacing: true
+arrowParens: "avoid"

sandbox/docker_web_app/Dockerfile

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+FROM node:18
+
+# Create app directory
+WORKDIR /usr/src/app
+
+# Install app dependencies
+# A wildcard is used to ensure both apckage.json AND package-lock.json are
+# copied where available (npm@5+)
+COPY package*.json ./
+
+RUN npm install
+# If you are building your code for production
+# RUN npm ci --omit=dev
+
+# BUNDLE app source
+COPY . .
+
+EXPOSE 8080
+CMD ["node", "server.js"]

sandbox/docker_web_app/README.md

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+## Basic Docker Usage with Node/Express backend
+
+This small project was taken from an article over at [nodejs.org](https://nodejs.org/en/docs/guides/nodejs-docker-webapp).
+
+### Of Note:
+
+Ensure that you have a .dockerignore file so that you don't copy your
+node_modules to the docker image:
+
+```
+node_modules
+npm-debug.log
+```
+
+### Build, run, test:
+```
+docker build . -t <your username>/node-web-app
+```
+```
+docker run -p 49160:8080 -d <your username>/node-web-app
+```
+
+Note that this is exposing docker's port 8080 to the host machine's port 49160
+in this case, so after running the image you can visit it on your host machine
+by going to localhost:49160, or for something this simple you can just use curl:
+
+```
+curl -i localhost:49160
+```
+
+If you want to go inside the container to check out the inside:
+
+```
+docker exec -it <container id> /bin/bash
+```
+
+### Further Reading:
+
+[Building Efficient Dockerfiles - Node.js](https://bitjudo.com/blog/2014/03/13/building-efficient-dockerfiles-node-dot-js/)
+
+[Introducing `npm ci` for faster, more reliable builds](https://blog.npmjs.org/post/171556855892/introducing-npm-ci-for-faster-more-reliable)

sandbox/docker_web_app/package.json

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+{
+    "name": "docker_web_app",
+    "version": "1.0.0",
+    "description": "",
+    "main": "index.js",
+    "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 1",
+        "start": "node server.js"
+    },
+    "keywords": [],
+    "author": "",
+    "license": "ISC",
+    "dependencies": {
+        "express": "^4.18.2"
+    }
+}

sandbox/docker_web_app/server.js

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+'use strict'
+const express = require('express')
+
+// Constants
+const PORT = 8080
+
+// App
+const app = express()
+app.get('/', (req, res) => {
+    res.send('Hello World')
+})
+
+app.listen(PORT, () => {
+    console.log(`Running on port: ${PORT}`)
+})