fix(netcup): allow wildcard domains (#863)

docs/netcup.md

@@ -26,7 +26,7 @@ Also keep in mind, that TTL, Expire, Retry and Refresh values of the given Domai
 
 ### Compulsory parameters
 
-- `"domain"` is the domain to update. It can be `example.com` (root domain) or `sub.example.com` (subdomain of `example.com`).
+- `"domain"` is the domain to update. It can be `example.com` (root domain) or `sub.example.com` (subdomain of `example.com`) or the wildcard `*.example.com`.
 - `"api_key"` is your api key (generated in the [customercontrolpanel](https://www.customercontrolpanel.de))
 - `"password"` is your api password (generated in the [customercontrolpanel](https://www.customercontrolpanel.de)). Netcup only allows one ApiPassword. This is not the account password. This password is used for all api keys.
 - `"customer_number"` is your customer number (viewable in the [customercontrolpanel](https://www.customercontrolpanel.de) next to your name). As seen in the example above, provide the number as string value.

internal/provider/providers/netcup/provider.go

@@ -38,7 +38,7 @@ func New(data json.RawMessage, domain, owner string,
 		return nil, fmt.Errorf("JSON decoding provider specific settings: %w", err)
 	}
 
-	err = validateSettings(domain, owner, extraSettings.CustomerNumber,
+	err = validateSettings(domain, extraSettings.CustomerNumber,
 		extraSettings.APIKey, extraSettings.Password)
 	if err != nil {
 		return nil, fmt.Errorf("validating provider specific settings: %w", err)
@@ -55,15 +55,13 @@ func New(data json.RawMessage, domain, owner string,
 	}, nil
 }
 
-func validateSettings(domain, owner, customerNumber, apiKey, password string) (err error) {
+func validateSettings(domain, customerNumber, apiKey, password string) (err error) {
 	err = utils.CheckDomain(domain)
 	if err != nil {
 		return fmt.Errorf("%w: %w", errors.ErrDomainNotValid, err)
 	}
 
 	switch {
-	case owner == "*":
-		return fmt.Errorf("%w", errors.ErrOwnerWildcard)
 	case customerNumber == "":
 		return fmt.Errorf("%w", errors.ErrCustomerNumberNotSet)
 	case apiKey == "":