Function build_tls_server_config 

pub fn build_tls_server_config(
    cert_data: &CertificateData,
) -> Result<ServerConfig, TlsError>

Build a rustls::ServerConfig enforcing TLS 1.3 (spec section 9.13).

Uses the ring crypto provider explicitly to avoid ambiguity when multiple providers are available via transitive dependencies.

Errors

Returns TlsError::Config if the TLS configuration cannot be built.