White label apps deployment

[Danielss89]

I am using your starter and am now looking at the release process and environment variables and have a question about this.
My app is a white label app. I have multiple different websites(all based on same code) and now i want to release multiple apps(also with same base code). Only different is theme and API urls and other configurable stuff.
My idea was to create multiple expo projects and set the config in the environment variables there, but as i see it, that won't work out with the way the starter kit uses .env.XXX files.
Can you point me in the right direction on how i should do this correctly?