fix: add brokers to env.example

Author: EvolveArt

infra/pragma-node/config/.env.example

@@ -2,4 +2,5 @@ DATABASE_URL="postgres://postgres:test-password@db:5432/pragma"
 DATABASE_MAX_CONN=5
 TOPIC="pragma-data"
 HOST="0.0.0.0"
-PORT=3000
+PORT=3000
+KAFKA_BROKERS="pragma-kafka:9092"

pragma-node/src/infra/kafka/mod.rs

@@ -8,7 +8,7 @@ lazy_static! {
         let brokers =
             std::env::var("KAFKA_BROKERS").expect("can't load kafka brokers list from env");
         ClientConfig::new()
-            .set("bootstrap.servers", brokers)
+            .set("bootstrap.servers", &brokers)
             .create()
             .expect("can't create kafka producer")
     };