Make the venv-manager usable again

See merge request !651

Co-authored-by: Malte Bauch <malte.bauch@stud.h-da.de>

controller/nucleus/pluginService.go

@@ -195,7 +195,7 @@ func saveStreamToFile(sc StreamClient, filename string, id uuid.UUID) (err error
 	}
 
 	// create the directory hierarchy based on the path
-	if err := os.MkdirAll(filepath.Dir(path), 0600); err != nil {
+	if err := os.MkdirAll(filepath.Dir(path), 0700); err != nil {
 		return err
 	}
 	// create the gostructs.go file at path