fix(tvix/nar-bridge): set correct service name

We should be able to distinguish tvix-store and nar-bridge.

Change-Id: I616c8e0c1ce2dbacab92975582dd36141b673aa2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12824
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>
Tested-by: BuildkiteCI

tvix/nar-bridge/src/bin/nar-bridge.rs

@@ -47,7 +47,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
         #[cfg(feature = "otlp")]
         {
             if cli.otlp {
-                builder = builder.enable_otlp("tvix.store");
+                builder = builder.enable_otlp("nar-bridge");
             }
         }
         builder.build()?