📝 Added sandbox (code sketchbook)

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)