mute formatter and docker

src/auto_archiver/formatters/mute_formatter.py

@@ -0,0 +1,15 @@
+from __future__ import annotations
+from dataclasses import dataclass
+from ..core import Metadata, Media
+from . import Formatter
+
+
+@dataclass
+class MuteFormatter(Formatter):
+    name = "mute_formatter"
+
+    def __init__(self, config: dict) -> None:
+        # without this STEP.__init__ is not called
+        super().__init__(config)
+
+    def format(self, item: Metadata) -> Media: return None