Support CODEX_API_KEY for codex exec (#4615)

Allows to set API key per invocation of `codex exec`

codex-rs/tui/src/lib.rs

@@ -361,7 +361,7 @@ async fn run_ratatui_app(
     // Initialize high-fidelity session event logging if enabled.
     session_log::maybe_init(&config);
 
-    let auth_manager = AuthManager::shared(config.codex_home.clone());
+    let auth_manager = AuthManager::shared(config.codex_home.clone(), false);
     let login_status = get_login_status(&config);
     let should_show_onboarding =
         should_show_onboarding(login_status, &config, should_show_trust_screen);