fix(portforward): rework run loop and fix deadlocks (#1874)

internal/portforward/service/fs.go

@@ -0,0 +1,23 @@
+package service
+
+import (
+	"fmt"
+	"os"
+)
+
+func (s *Service) writePortForwardedFile(port uint16) (err error) {
+	filepath := *s.settings.UserSettings.Filepath
+	s.logger.Info("writing port file " + filepath)
+	const perms = os.FileMode(0644)
+	err = os.WriteFile(filepath, []byte(fmt.Sprint(port)), perms)
+	if err != nil {
+		return fmt.Errorf("writing file: %w", err)
+	}
+
+	err = os.Chown(filepath, s.puid, s.pgid)
+	if err != nil {
+		return fmt.Errorf("chowning file: %w", err)
+	}
+
+	return nil
+}