упаковал всё в docker-compose

lab3/producer/app/src/main/java/dev/tishenko/producer/Send.java

@@ -9,7 +9,7 @@ public class Send {
 
     public static void main(String[] args) throws Exception {
         ConnectionFactory factory = new ConnectionFactory();
-        factory.setHost("localhost");
+        factory.setHost("rabbitmq");
         try (Connection connection = factory.newConnection();
                 Channel channel = connection.createChannel()) {
             channel.queueDeclare(QUEUE_NAME, false, false, false, null);