Maint: upgrade golibs and env error wrapping

internal/configuration/privado.go

@@ -1,6 +1,8 @@
 package configuration
 
 import (
+	"fmt"
+
 	"github.com/qdm12/gluetun/internal/constants"
 )
 
@@ -39,22 +41,22 @@ func (settings *Provider) readPrivado(r reader) (err error) {
 
 	settings.ServerSelection.Countries, err = r.env.CSVInside("COUNTRY", constants.PrivadoCountryChoices())
 	if err != nil {
-		return err
+		return fmt.Errorf("environment variable COUNTRY: %w", err)
 	}
 
 	settings.ServerSelection.Regions, err = r.env.CSVInside("REGION", constants.PrivadoRegionChoices())
 	if err != nil {
-		return err
+		return fmt.Errorf("environment variable REGION: %w", err)
 	}
 
 	settings.ServerSelection.Cities, err = r.env.CSVInside("CITY", constants.PrivadoCityChoices())
 	if err != nil {
-		return err
+		return fmt.Errorf("environment variable CITY: %w", err)
 	}
 
 	settings.ServerSelection.Hostnames, err = r.env.CSVInside("SERVER_HOSTNAME", constants.PrivadoHostnameChoices())
 	if err != nil {
-		return err
+		return fmt.Errorf("environment variable SERVER_HOSTNAME: %w", err)
 	}
 
 	return nil