dotenv-flow: Environment Variable Management

dotenv-flow is an extension of the popular `dotenv` package, designed to simplify environment variable management across multiple deployment environments in Node.js applications. It introduces robust support for `NODE_ENV`-specific `.env` files (e.g., `.env.development`, `.env.production`, `.env.test`) and `.local` overrides (e.g., `.env.development.local`) to manage environment variables dynamically based on the current `NODE_ENV`. The package automatically loads the appropriate `.env` files in a predefined order, allowing variables in more specific files to override those in more general ones. This structured approach is inspired by Ruby's `dotenv-rails` and CreateReactApp's configuration patterns, adhering closely to the Twelve-Factor App methodology's principles for storing configuration in the environment. The current stable version is 4.1.0, with an active release cadence that regularly introduces new features and bug fixes, such as customizable file patterns in v4.0.0 and explicit file lists in v4.1.0, enhancing its flexibility and control over environment loading.