fix: use dedicated rabbitmq user for CI service container

.github/workflows/pull_request.yml

@@ -26,15 +26,22 @@ jobs:
           --health-timeout 5s
           --health-retries 10
       rabbitmq:
+        # Default 'guest' user is restricted to localhost in RabbitMQ.
+        # GitHub Actions service containers route through port forwarding,
+        # so the broker sees connections as non-localhost and rejects
+        # 'guest'. Override with a dedicated test user.
         image: rabbitmq:4-management
+        env:
+          RABBITMQ_DEFAULT_USER: trax
+          RABBITMQ_DEFAULT_PASS: trax123
         ports:
           - 5672:5672
           - 15672:15672
         options: >-
           --health-cmd "rabbitmq-diagnostics -q ping"
           --health-interval 5s
           --health-timeout 5s
-          --health-retries 10
+          --health-retries 20
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-dotnet@v4

tests/Trax.Api.Tests/PersistedOperations/IntegrationTests/RabbitMqBroadcasterTests.cs

@@ -16,7 +16,11 @@ namespace Trax.Api.Tests.PersistedOperations.IntegrationTests;
 [Category("Integration")]
 public class RabbitMqBroadcasterTests
 {
-    private const string AmqpUri = "amqp://guest:guest@localhost:5672/";
+    // Both the docker-compose dev broker (Trax.Samples/docker-compose.yml)
+    // and the CI service container (.github/workflows/pull_request.yml) are
+    // configured with these credentials. Default 'guest' would work locally
+    // but RabbitMQ rejects it from non-localhost in CI's port-forwarded setup.
+    private const string AmqpUri = "amqp://trax:trax123@localhost:5672/";
 
     private static bool IsRabbitMqReachable()
     {