improvements in namespace inspect command

[Exar04]

reference : #3851

this pr adds information of containers in the given namespace

[Exar04]

Should I add all the data of containers? like right now its just exposing id, name, and image

[Exar04]

I’m having trouble understanding the failed tests. Could someone please help explain them?

[haytok]

Hi, @Exar04
Thanks for the PR! Could you please add tests for this change before we move forward?

[AkihiroSuda]

Why not just use nerdctl container ls

[Exar04]

@AkihiroSuda this pr adds additional metadata for a given namespace

The issue stated

namespace inspect should at least have the same information available on namespace list

which is namespace name, images, volumes, containers and labels

$ nerdctl ns list
NAME               CONTAINERS    IMAGES    VOLUMES    LABELS
default            2             4         0              
default_history    0             0         0         

Previously, the command only returned the namespace name and labels ->

$ nerdctl ns inspect default
[
    {
        "Name": "default",
        "Labels": null
    }
]

Now this PR adds container data as well ->

$ nerdctl ns inspect default
[
    {
        "Name": "default",
        "Labels": null,
        "Containers": [
            {
                "id": "1d92cb93e730746035be84ff8d32faa60240d85ecf8c38f99ae50c6aaa246b7e",
                "image": "docker.io/library/hello-world:latest",
                "name": "io.containerd.runc.v2"
            },
            {
                "id": "7c43b7c3c735755d97353b9afe85d47690cb7511eceac63d0e123ac3060309f1",
                "image": "docker.io/library/nginx:latest",
                "name": "io.containerd.runc.v2"
            }
        ]
    }
]