migrations: also migrate dovecot control files

migrations/nixos-mailserver-migration-03.py

@@ -38,7 +38,13 @@ def check_user(vmail_root: Path):
 
 
 def is_maildir_related(path: Path, layout: FolderLayout) -> bool:
-    if path.name in ["subscriptions"]:
+    if path.name in [
+        "subscriptions"
+        # https://doc.dovecot.org/2.3/admin_manual/mailbox_formats/maildir/#imap-uid-mapping
+        "dovecot-uidlist",
+        # https://doc.dovecot.org/2.3/admin_manual/mailbox_formats/maildir/#imap-keywords
+        "dovecot-keywords",
+    ]:
         return True
     if not path.is_dir():
         return False