Fix LocalStack integration tests to detect and use existing LocalStack container in CI

Author: NinjaRocks

tests/SourceFlow.Cloud.AWS.Tests/TestHelpers/LocalStackTestFixture.cs

@@ -57,21 +57,27 @@ public async Task InitializeAsync()
             return;
         }
 
-        // Create LocalStack container
-        _localStackContainer = new ContainerBuilder()
-            .WithImage("localstack/localstack:latest")
-            .WithPortBinding(4566, 4566)
-            .WithEnvironment("SERVICES", "sqs,sns,kms")
-            .WithEnvironment("DEBUG", "1")
-            .WithEnvironment("DATA_DIR", "/tmp/localstack/data")
-            .WithWaitStrategy(Wait.ForUnixContainer().UntilPortIsAvailable(4566))
-            .Build();
-        
-        // Start LocalStack
-        await _localStackContainer.StartAsync();
-        
-        // Wait a bit for services to be ready
-        await Task.Delay(2000);
+        // Check if LocalStack is already running (e.g., in GitHub Actions)
+        bool isAlreadyRunning = await _configuration.IsLocalStackAvailableAsync(TimeSpan.FromSeconds(2));
+        
+        if (!isAlreadyRunning)
+        {
+            // Create LocalStack container
+            _localStackContainer = new ContainerBuilder()
+                .WithImage("localstack/localstack:latest")
+                .WithPortBinding(4566, 4566)
+                .WithEnvironment("SERVICES", "sqs,sns,kms")
+                .WithEnvironment("DEBUG", "1")
+                .WithEnvironment("DATA_DIR", "/tmp/localstack/data")
+                .WithWaitStrategy(Wait.ForUnixContainer().UntilPortIsAvailable(4566))
+                .Build();
+            
+            // Start LocalStack
+            await _localStackContainer.StartAsync();
+            
+            // Wait a bit for services to be ready
+            await Task.Delay(2000);
+        }
 
         // Create AWS clients configured for LocalStack
         var config = new Amazon.SQS.AmazonSQSConfig
@@ -114,6 +120,7 @@ public async Task DisposeAsync()
         SnsClient?.Dispose();
         KmsClient?.Dispose();
 
+        // Only stop container if we started it
         if (_localStackContainer != null)
         {
             await _localStackContainer.StopAsync();