make setting dynamic

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2607>

api/funkwhale_api/music/dynamic_preferences_registry.py

@@ -32,3 +32,18 @@ class MusicCacheDuration(types.IntPreference):
         "will be erased and retranscoded on the next listening."
     )
     field_kwargs = {"required": False}
+
+
+@global_preferences_registry.register
+class MbidTaggedContent(types.BooleanPreference):
+    show_in_api = True
+    section = music
+    name = "only_allow_musicbrainz_tagged_files"
+    verbose_name = "Only allow Musicbrainz tagged files"
+    help_text = (
+        "Only Musicbrainz tagged files will be allowed to be uploaded on the server. "
+        "If files where uploaded before this settings will not affect them. "
+        "To clean the db from files not following mb tags use the funkwhale cli "
+        "or use quality filters"
+    )
+    default = False

api/funkwhale_api/music/tasks.py

@@ -247,10 +247,8 @@ def process_upload(upload, update_denormalization=True):
             return fail_import(
                 upload, "invalid_metadata", detail=detail, file_metadata=metadata_dump
             )
-        if (
-            settings.ONLY_ALLOW_MUSICBRAINZ_TAGGED_FILES is True
-            and not serializer.validated_data.get("mbid")
-        ):
+        check_mbid = preferences.get("music__only_allow_musicbrainz_tagged_files")
+        if check_mbid is True and not serializer.validated_data.get("mbid"):
             return fail_import(
                 upload,
                 "Uploading files without a MusicBrainz ID is not permitted in this pod",