Function background_acme_task 

pub async fn background_acme_task(
    acme_configs: Vec<AcmeConfig>,
    acme_on_demand_configs: Vec<AcmeOnDemandConfig>,
    memory_acme_account_cache_data: Arc<RwLock<HashMap<String, Vec<u8>>>>,
    acme_on_demand_rx: Receiver<(String, u16)>,
    on_demand_tls_ask_endpoint: Option<Uri>,
    on_demand_tls_ask_endpoint_verify: bool,
    acme_logger: ErrorLogger,
    crypto_provider: Arc<CryptoProvider>,
    existing_combinations: HashSet<(String, u16)>,
)

Performs background automatic TLS tasks.