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