Add support for tracing in run_docker_compare.bash.

src/init_tracing.rs

@@ -15,7 +15,8 @@ pub fn init_telemetry() -> Result<(), Box<dyn std::error::Error>> {
     // TODO: I think the endpoint can be controlled by the OTEL_EXPORTER_OTLP_TRACES_ENDPOINT env variable instead of hard-coded into this code base. Regardless, I am the only developer right now so I am not too concerned.
     let exporter = opentelemetry_otlp::new_exporter()
         .tonic()
-        .with_endpoint("http://localhost:4317/v1/traces");
+        // Using "localhost" is broken inside the docker container when tracing
+        .with_endpoint("http://127.0.0.1:4317/v1/traces");
 
     let tracer = opentelemetry_otlp::new_pipeline()
         .tracing()