First time you're starting the application, install the dependencies:
docker-compose run web npm install
Then start the web server with:
docker-compose up
Then in the browser: http://localhost:1337
After a bit of research, you should have noticed that the cowsay package does exactly what you need. Install it with:
docker-compose run web npm install cowsay
Then generate the new controller and an action with:
docker-compose run web sails generate controller Cowsay say
Update the action code accordingly.
Add the route in the config/routes.js file. Head to
http://localhost:1337/say and here you are! Let me introduce
you to Marguerite, the talking cow.