Function run 

pub fn run<F: Fn(&Context) -> Result<()>>(f: F) -> Result<()>

Entrypoint for execution

pulumi_gestalt_rust::run(|ctx| {
    // your code here
    let output = ctx.new_output(&"Hello, Pulumi!".to_string());
    ctx.add_export("greeting", &output);
    Ok(())
}).unwrap();