Function init_with 

pub fn init_with(
    path: &Path,
    provider: Option<&str>,
    model: Option<&str>,
    region: Option<&str>,
    force: bool,
    found: Option<Found>,
    env: &dyn Fn(&str) -> Option<String>,
) -> CommandResult

speccoder init [--provider] [--model] [--region] [--force] with an explicit view of the environment (a variable’s value when it is set) and of what is installed.