Avoiding environment conflicts with Kamal and Dotenv

We often rely on an .env file in development when using Dotenv. This is a direct opposite for Kamal that also loads the same .env file, but for deployment. As an example we might rely on RAILS_MASTER_KEY in an .env file which will differ from development and production. To figure out the right action to take we have to understand what these tools do with the env files in the first place.