I use dotenvy! for development to load from .env and env! in production to load from regular env (GitHub Workflows), now I have a feature flag to switch between the two but it's very inconvenient and repetitive.

#[cfg(feature = "production")]
const EXAMPLE_ENV: &str = dotenv!("EXAMPLE_ENV");
#[cfg(not(feature = "production"))]
const EXAMPLE_ENV: &str = env!("EXAMPLE_ENV");

Having a macro that falls back to the regular env would be nice.