nerdctl-0.19.0-go-mod-vendor.tar.gz is broken

[AkihiroSuda]

$ tar tzvf nerdctl-0.19.0-go-mod-vendor.tar.gz | head
-rw-r--r--  0 root   root     8392  4 22 13:02 go.mod
-rw-r--r--  0 root   root   245979  4 22 13:02 go.sum
drwxr-xr-x  0 root   root        0  4 22 13:21 vendor/
drwxr-xr-x  0 root   root        0  4 22 13:21 gotest.tools/
drwxr-xr-x  0 root   root        0  4 22 13:21 v3/
drwxr-xr-x  0 root   root        0  4 22 13:21 assert/
drwxr-xr-x  0 root   root        0  4 22 13:21 cmp/
-rw-r--r--  0 root   root      744  4 22 13:21 compare_go113.go
-rw-r--r--  0 root   root     2537  4 22 13:21 result.go
-rw-r--r--  0 root   root    10608  4 22 13:21 compare.go

The expected layout is:

- go.mod
- go.sum
- vendor/**/*.go