backups: implement list the easy way

pkgs/clan-cli/tests/test_backups.py

@@ -1,22 +1,20 @@
-import logging
-
+import pytest
 from cli import Cli
 from fixtures_flakes import FlakeForTest
 
-log = logging.getLogger(__name__)
-
 
+@pytest.mark.impure
 def test_backups(
-    test_flake: FlakeForTest,
+    test_flake_with_core: FlakeForTest,
 ) -> None:
     cli = Cli()
 
     cli.run(
         [
             "--flake",
-            str(test_flake.path),
+            str(test_flake_with_core.path),
             "backups",
             "list",
-            "testhostname",
+            "vm1",
         ]
     )