How to deploy a Next.js app to Dokku

If you haven't already, create your Next.js app by following the procedure outlined in the Next.js docs.

To deploy a Next.js app to Dokku, you have to do two things:

1. Tell Dokku to build the app before running it:

app.json
{
    "scripts": {
        "dokku": {
            "predeploy": "npm run build"
        }
    }
}

2. Tell Dokku how to start the app:

Procfile
web: npm start -- --port $PORT

That's it! :)