I've been following the official Strapi tutorials on how to develop and deploy an application to Heroku and it seems you have to configure some files like ./config/environments/**/database.json.
The problem is that, installing the app without --quickstart (yarn create strapi-app my-project), my config folder just has a functions folder and database.js and server.js files.
Should I create manually this database.json or is this supposed to be created automatically when initializing the app without --quickstart?
I was also confused so I manually created the folders /environments/production and inside the file database.json and it worked for me.
Link to the docs: https://strapi.io/documentation/3.0.0-beta.x/deployment/heroku.html#_4-update-your-database-config-file