Command that will always run when the system starts. If not set, the default command (CMD) of the image is performed.
command: ['COMMAND_GOES_HERE', "arg1", "arg2", ...], // Old style (still supported but not recommended) command: 'COMMAND_GOES_HERE',
In a node.js application it would be interesting to run
npm start to start the web server.
command: ['npm', 'start'],
In turn, in rails, we would start with
command: ['bundle', 'exec', 'rackup', 'config.ru', '--port', '$HTTP_PORT'],