How to set environment variables for 2 or more Symfony4 applications?

Question

symfony

Please tell me how to set environment variables on VPS for multiple applications on SF4?
For example, there is a .env file on dev:
APP_ENV=dev
APP_SECRET=...
DATABASE_URL=mysql://db_user:[email protected]:3306/db_name
I'll put this in /etc/enviroment in the VPS. But if I have another site on symphony, then how to specify other APP_SECRET and DATABASE_URL for it?
Or have I misunderstood something?

Answer 1

/etc/environment in VPS

and why suddenly the project settings should be there?