chore(config): upgrade to gosettings v0.4.0

- drop qdm12/govalid dependency
- upgrade qdm12/ss-server to v0.6.0
- do not unset sensitive config settings (makes no sense to me)

internal/configuration/sources/secrets/helpers.go

@@ -1,58 +1,8 @@
 package secrets
 
-import (
-	"fmt"
-	"net/netip"
-	"strings"
-
-	"github.com/qdm12/gluetun/internal/configuration/sources/files"
-	"github.com/qdm12/gluetun/internal/openvpn/extract"
-	"github.com/qdm12/gosettings/sources/env"
-)
-
-func (s *Source) readSecretFileAsStringPtr(secretPathEnvKey, defaultSecretPath string) (
-	stringPtr *string, err error) {
-	path := s.env.String(secretPathEnvKey, env.ForceLowercase(false))
-	if path == "" {
-		path = defaultSecretPath
+func strPtrToStringIsSet(ptr *string) (s string, isSet bool) {
+	if ptr == nil {
+		return "", false
 	}
-	return files.ReadFromFile(path)
-}
-
-func (s *Source) readPEMSecretFile(secretPathEnvKey, defaultSecretPath string) (
-	base64Ptr *string, err error) {
-	pemData, err := s.readSecretFileAsStringPtr(secretPathEnvKey, defaultSecretPath)
-	if err != nil {
-		return nil, fmt.Errorf("reading secret file: %w", err)
-	}
-
-	if pemData == nil {
-		return nil, nil //nolint:nilnil
-	}
-
-	base64Data, err := extract.PEM([]byte(*pemData))
-	if err != nil {
-		return nil, fmt.Errorf("extracting base64 encoded data from PEM content: %w", err)
-	}
-
-	return &base64Data, nil
-}
-
-func parseAddresses(addressesCSV string) (addresses []netip.Prefix, err error) {
-	if addressesCSV == "" {
-		return nil, nil
-	}
-
-	addressStrings := strings.Split(addressesCSV, ",")
-	addresses = make([]netip.Prefix, len(addressStrings))
-	for i, addressString := range addressStrings {
-		addressString = strings.TrimSpace(addressString)
-		addresses[i], err = netip.ParsePrefix(addressString)
-		if err != nil {
-			return nil, fmt.Errorf("parsing address %d of %d: %w",
-				i+1, len(addressStrings), err)
-		}
-	}
-
-	return addresses, nil
+	return *ptr, true
 }