pulumi config set aws:endpoints <http://localhost:4566>

localstack start --host

var providerArgs = new ProviderArgs
{
    Region = "eu-central-1",
    Endpoints = new[]
    {
        new ProviderEndpointArgs
        {
            S3 = "<http://localhost:4566>",
            Sts = "<http://localhost:4566>"
        }
    },
    S3ForcePathStyle = true,
    AccessKey = "ignored",
    SecretKey = "ignored"
};

var provider = new Provider("local-stack", providerArgs);

var defaultResourceOptions = new CustomResourceOptions
{
    Provider = provider,
};

var bucket = new Bucket("my-bucket", options: defaultResourceOptions);