Run the following command in the terminal to build the Docker image of this application.
docker build -t [image-name]:[version-tag] .
This will build an image name image-name with a version tag of version-tag.
Run the following command in the terminal to build the Docker image of this applicaiton.
docker run -itd -p 80:3000 --name [container-name] [image-name]
This builds the image as a running application on local port 80. The app is listening on port 3000.