Add type alias for Arc<OnceServices>

Signed-off-by: Jason Volk <jason@zemos.net>

src/service/mod.rs

@@ -33,6 +33,8 @@ pub mod users;
 pub(crate) use once_services::OnceServices;
 pub(crate) use service::{Args, Service};
 
+pub(crate) type SelfServices = std::sync::Arc<OnceServices>;
+
 pub use crate::services::Services;
 
 tuwunel_core::mod_ctor! {}