fix: unblock config loader split CI

Co-authored-by: Codex <noreply@openai.com>

codex-rs/config/Cargo.toml

@@ -4,6 +4,9 @@ version.workspace = true
 edition.workspace = true
 license.workspace = true
 
+[lib]
+doctest = false
+
 [lints]
 workspace = true
 

codex-rs/config/src/loader.rs

@@ -13,6 +13,7 @@ use std::path::Path;
 #[cfg(windows)]
 use std::path::PathBuf;
 
+#[cfg(unix)]
 pub const SYSTEM_CONFIG_TOML_FILE_UNIX: &str = "/etc/codex/config.toml";
 
 #[cfg(windows)]