fix case where confdir is a list of paths

frappy/lib/__init__.py

@@ -116,6 +116,9 @@ class GeneralConfig:
         for key in mandatory:
             env = environ.get(f'FRAPPY_{key.upper()}')
             if env is not None:
+                if ':' in env:
+                    cfg[key] = [Path(v) for v in env.split(':')]
+                else:
                     cfg[key] = Path(env)
         missing_keys = [
             key for key in mandatory