 file data0",   "ADD d0 dir",   "ADD d0/abc file data0",   "ADD d0/def symlink abc",   "ADD d0/ghi symlink nosuchfile",  }   ref = createRef(t, cm, ch)   cc, err = newCacheContext(ref.Metadata(), nil)  require.NoError(t, err)   dgst, err = cc.Checksum(context.TODO(), ref, "