fix: propagate tracing context headers

Author: agmmtoo

instrumentation.ts

@@ -3,5 +3,10 @@ import { registerOTel } from '@vercel/otel'
 export function register() {
   registerOTel({
     serviceName: 'librarease-next',
+    instrumentationConfig: {
+      fetch: {
+        propagateContextUrls: [process.env.API_URL!],
+      },
+    },
   })
 }