docs: update localstack example for testcontainers-go

Author: mdelapenya

content/en/user-guide/integrations/testcontainers/index.md

@@ -58,7 +58,7 @@ await localStackContainer.StartAsync()
     .ConfigureAwait(false);
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 {{< tab header="Go" lang="go">}}
-container, err := localstack.StartContainer(ctx, localstack.NoopOverrideContainerRequest)
+container, err := localstack.Run(ctx, "localstack/localstack:latest")
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 {{< tab header="Java" lang="java">}}
 LocalStackContainer localstack = new LocalStackContainer(DockerImageName.parse("localstack/localstack:3"));
@@ -77,46 +77,50 @@ config.ServiceURL = localStackContainer.GetConnectionString();
 using var client = new AmazonS3Client(config);
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 {{< tab header="Go" lang="go">}}
+type resolverV2 struct {
+	// you could inject additional application context here as well
+}
+
+func (*resolverV2) ResolveEndpoint(ctx context.Context, params s3.EndpointParameters) (
+	smithyendpoints.Endpoint, error,
+) {
+	// delegate back to the default v2 resolver otherwise
+	return s3.NewDefaultEndpointResolverV2().ResolveEndpoint(ctx, params)
+}
+
 func s3Client(ctx context.Context, l *localstack.LocalStackContainer) (*s3.Client, error) {
-    // the Testcontainers Docker provider is used to get the host of the Docker daemon
-    provider, err := testcontainers.NewDockerProvider()
-    if err != nil {
-        return nil, err
-    }
-
-    host, err := provider.DaemonHost(ctx)
-    if err != nil {
-        return nil, err
-    }
-
-    mappedPort, err := l.MappedPort(ctx, nat.Port("4566/tcp"))
-    if err != nil {
-        return nil, err
-    }
-
-    customResolver := aws.EndpointResolverWithOptionsFunc(
-        func(service, region string, opts ...interface{}) (aws.Endpoint, error) {
-            return aws.Endpoint{
-                PartitionID:   "aws",
-                URL:           fmt.Sprintf("http://%s:%d", host, mappedPort.Int()),
-                SigningRegion: region,
-            }, nil
-        })
-
-    awsCfg, err := config.LoadDefaultConfig(context.TODO(),
-        config.WithRegion(region),
-        config.WithEndpointResolverWithOptions(customResolver),
-        config.WithCredentialsProvider(credentials.NewStaticCredentialsProvider(accesskey, secretkey, token)),
-    )
-    if err != nil {
-        return nil, err
-    }
-
-    client := s3.NewFromConfig(awsCfg, func(o *s3.Options) {
-        o.UsePathStyle = true
-    })
-
-    return client, nil
+	mappedPort, err := l.MappedPort(ctx, nat.Port("4566/tcp"))
+	if err != nil {
+		return nil, err
+	}
+
+	provider, err := testcontainers.NewDockerProvider()
+	if err != nil {
+		return nil, err
+	}
+	defer provider.Close()
+
+	host, err := provider.DaemonHost(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	awsCfg, err := config.LoadDefaultConfig(context.TODO(),
+		config.WithRegion(region),
+		config.WithCredentialsProvider(credentials.NewStaticCredentialsProvider(accesskey, secretkey, token)),
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	// reference: https://aws.github.io/aws-sdk-go-v2/docs/configuring-sdk/endpoints/#with-both
+	client := s3.NewFromConfig(awsCfg, func(o *s3.Options) {
+		o.BaseEndpoint = aws.String("http://" + host + ":" + mappedPort.Port())
+		o.EndpointResolverV2 = &resolverV2{}
+		o.UsePathStyle = true
+	})
+
+	return client, nil
 }
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 {{< tab header="Java" lang="java">}}