test: disable skopeo inspect localstore test

The test fails in github actions but it's useful to keep until we fix
it.  Mark it as disabled and keep a comment to investigate.

test/scripts/test_imgtestlib.py

@@ -83,6 +83,7 @@ def test_skopeo_inspect_image_manifest(arch):
 
 @pytest.mark.skipif(not can_sudo_nopw(), reason="requires passwordless sudo")
 @pytest.mark.parametrize("arch", TEST_ARCHES)
+@pytest.mark.skip("disabled")  # disabled: fails in github action - needs work
 def test_skopeo_inspect_localstore(arch):
     transport = "containers-storage:"
     image = "registry.gitlab.com/redhat/services/products/image-builder/ci/osbuild-composer/manifest-list-test:latest"