#nodejs

I have a Node.js application with a package.json file. Create a Dockerfile to containerize this application. The Dockerfile should install dependencies, copy the application code, and specify the command to run the application. Optimize the Dockerfile for smaller image size and faster builds.

Let's code together. I want to build a simple command-line to-do list application in Node.js. Let's start by outlining the features. Then, you can help me write the code for adding a new task. I will ask questions as we go.

What is the best practice for managing environment variables (e.g., API keys, database passwords) in a Node.js project? Explain the use of `.env` files and the `dotenv` package. Provide an example of how to load and access variables from a `.env` file.