Simple docker container for a simple node js http app

• one container from node:carbon
• command to run on start in the compose file (because I am not using my own Dockerfile)
• the container opens port 8080 and maps it to 8080 (which the node script is listening to)
• one server.js file is called in the package.json startup script
• the server.js creates an http server which listens to port 8080 and returns text and http code 200