Function print_deprecated_warning

crates/ostree-ext/src/cli.rs:680–683

Write a deprecation notice, and sleep for 3 seconds.

(msg: &str)

/// Write a deprecation notice, and sleep for 3 seconds.
pub async fn print_deprecated_warning(msg: &str) {
    eprintln!("warning: {msg}");
    tokio::time::sleep(std::time::Duration::from_secs(3)).await
}

/// Import a container image with an encapsulated ostree commit.
async fn container_import(