## Overview
This is a simple demo meant to demonstrate the process of using environment variables with Docker/React.  When we build the image we pass the value of the environment variables as build arguments.  You can specify as many as you need.  In this example I am only using one but you can have multiple like this as well:

```shell
docker build --build-arg ARG1=test --build-arg ARG2=test .
```


## Build and run
To build and run this example you can use the below commands.
```shell
docker build -t react-docker-test --build-arg MY_VARIABLE=world .
docker run -p 3000:3000 react-docker-test
```

If everything goes well, once the application has fully started you should be able to navigate to `http://localhost:3000` in your browser and see the text "Hello world" on the screen.