ctr images export doesn't work

**Description**



When I try to export an image using `ctr`, it failed w/ below error message:
```
ctr -n k8s.io images export image.tar <whatever-my-image-ref>
ctr: failed to get reader: content digest sha256:150b15dcf8cb1d3adc092e340f6d3e1521fcd4e2136d0a2cd457f934a3d22205: not found
```

By running `ctr -n k8s.io images ls`, I can see the platform for the image is `linux/amd64`:
```
REF                       TYPE                                                      DIGEST                                                                  SIZE      PLATFORMS                                                                    LABELS
<whatever-my-image-ref>   application/vnd.docker.distribution.manifest.v2+json      sha256:92528b54f308d94ed26e8c436948e7d2620bd9b03f4dd6a0c5c1ef4257e6c997 365.3 MiB linux/amd64                                                                  io.cri-containerd.image=managed
```

However, I see the same error even if I add `--platform`:
```
ctr -n k8s.io images export image.tar <whatever-my-image-ref> --platform linux/amd64
```

**What version of containerd are you using:**

```
$ containerd --version
containerd github.com/containerd/containerd v1.5.2 36cc874494a56a253cd181a1a685b44b58a2e34a
```

**Any other relevant information (runC version, CRI configuration, OS/Kernel version, etc.):**



<details><summary><code>runc --version</code></summary><br><pre>
$ runc --version
runc version 1.0.0-rc95
commit: b9ee9c6314599f1b4a7f497e1f1f856fe433d3b7
spec: 1.0.2-dev
go: go1.16.4
libseccomp: 2.5.1
</pre></details>



<details><summary><code>crictl info</code></summary><br><pre>
$ crictl info
{
  "status": {
    "conditions": [
      {
        "type": "RuntimeReady",
        "status": true,
        "reason": "",
        "message": ""
      },
      {
        "type": "NetworkReady",
        "status": true,
        "reason": "",
        "message": ""
      }
    ]
  },
  "cniconfig": {
    "PluginDirs": [
      "/opt/cni/bin"
    ],
    "PluginConfDir": "/etc/cni/net.d",
    "PluginMaxConfNum": 1,
    "Prefix": "eth",
    "Networks": [
      {
        "Config": {
          "Name": "cni-loopback",
          "CNIVersion": "0.3.1",
          "Plugins": [
            {
              "Network": {
                "type": "loopback",
                "ipam": {},
                "dns": {}
              },
              "Source": "{\"type\":\"loopback\"}"
            }
          ],
          "Source": "{\n\"cniVersion\": \"0.3.1\",\n\"name\": \"cni-loopback\",\n\"plugins\": [{\n  \"type\": \"loopback\"\n}]\n}"
        },
        "IFName": "lo"
      },
      {
        "Config": {
          "Name": "kindnet",
          "CNIVersion": "0.3.1",
          "Plugins": [
            {
              "Network": {
                "type": "ptp",
                "ipam": {
                  "type": "host-local"
                },
                "dns": {}
              },
              "Source": "{\"ipMasq\":false,\"ipam\":{\"dataDir\":\"/run/cni-ipam-state\",\"ranges\":[[{\"subnet\":\"10.244.2.0/24\"}]],\"routes\":[{\"dst\":\"0.0.0.0/0\"}],\"type\":\"host-local\"},\"mtu\":1500,\"type\":\"ptp\"}"
            },
            {
              "Network": {
                "type": "portmap",
                "capabilities": {
                  "portMappings": true
                },
                "ipam": {},
                "dns": {}
              },
              "Source": "{\"capabilities\":{\"portMappings\":true},\"type\":\"portmap\"}"
            }
          ],
          "Source": "\n{\n\t\"cniVersion\": \"0.3.1\",\n\t\"name\": \"kindnet\",\n\t\"plugins\": [\n\t{\n\t\t\"type\": \"ptp\",\n\t\t\"ipMasq\": false,\n\t\t\"ipam\": {\n\t\t\t\"type\": \"host-local\",\n\t\t\t\"dataDir\": \"/run/cni-ipam-state\",\n\t\t\t\"routes\": [\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t{ \"dst\": \"0.0.0.0/0\" }\n\t\t\t],\n\t\t\t\"ranges\": [\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t[ { \"subnet\": \"10.244.2.0/24\" } ]\n\t\t\t]\n\t\t}\n\t\t,\n\t\t\"mtu\": 1500\n\t\t\n\t},\n\t{\n\t\t\"type\": \"portmap\",\n\t\t\"capabilities\": {\n\t\t\t\"portMappings\": true\n\t\t}\n\t}\n\t]\n}\n"
        },
        "IFName": "eth0"
      }
    ]
  },
  "config": {
    "containerd": {
      "snapshotter": "overlayfs",
      "defaultRuntimeName": "runc",
      "defaultRuntime": {
        "runtimeType": "",
        "runtimeEngine": "",
        "PodAnnotations": null,
        "ContainerAnnotations": null,
        "runtimeRoot": "",
        "options": null,
        "privileged_without_host_devices": false,
        "baseRuntimeSpec": ""
      },
      "untrustedWorkloadRuntime": {
        "runtimeType": "",
        "runtimeEngine": "",
        "PodAnnotations": null,
        "ContainerAnnotations": null,
        "runtimeRoot": "",
        "options": null,
        "privileged_without_host_devices": false,
        "baseRuntimeSpec": ""
      },
      "runtimes": {
        "runc": {
          "runtimeType": "io.containerd.runc.v2",
          "runtimeEngine": "",
          "PodAnnotations": null,
          "ContainerAnnotations": null,
          "runtimeRoot": "",
          "options": null,
          "privileged_without_host_devices": false,
          "baseRuntimeSpec": ""
        },
        "test-handler": {
          "runtimeType": "io.containerd.runc.v2",
          "runtimeEngine": "",
          "PodAnnotations": null,
          "ContainerAnnotations": null,
          "runtimeRoot": "",
          "options": null,
          "privileged_without_host_devices": false,
          "baseRuntimeSpec": ""
        }
      },
      "noPivot": false,
      "disableSnapshotAnnotations": true,
      "discardUnpackedLayers": true
    },
    "cni": {
      "binDir": "/opt/cni/bin",
      "confDir": "/etc/cni/net.d",
      "maxConfNum": 1,
      "confTemplate": ""
    },
    "registry": {
      "configPath": "",
      "mirrors": null,
      "configs": null,
      "auths": null,
      "headers": null
    },
    "imageDecryption": {
      "keyModel": "node"
    },
    "disableTCPService": true,
    "streamServerAddress": "127.0.0.1",
    "streamServerPort": "0",
    "streamIdleTimeout": "4h0m0s",
    "enableSelinux": false,
    "selinuxCategoryRange": 1024,
    "sandboxImage": "k8s.gcr.io/pause:3.5",
    "statsCollectPeriod": 10,
    "systemdCgroup": false,
    "enableTLSStreaming": false,
    "x509KeyPairStreaming": {
      "tlsCertFile": "",
      "tlsKeyFile": ""
    },
    "maxContainerLogSize": 16384,
    "disableCgroup": false,
    "disableApparmor": false,
    "restrictOOMScoreAdj": false,
    "maxConcurrentDownloads": 3,
    "disableProcMount": false,
    "unsetSeccompProfile": "",
    "tolerateMissingHugetlbController": true,
    "disableHugetlbController": true,
    "ignoreImageDefinedVolumes": false,
    "netnsMountsUnderStateDir": false,
    "containerdRootDir": "/var/lib/containerd",
    "containerdEndpoint": "/run/containerd/containerd.sock",
    "rootDir": "/var/lib/containerd/io.containerd.grpc.v1.cri",
    "stateDir": "/run/containerd/io.containerd.grpc.v1.cri"
  },
  "golang": "go1.16.4",
  "lastCNILoadStatus": "OK"
}
</pre></details>


<details><summary><code>uname -a</code></summary><br><pre>
$ uname -a
Linux my-demo-server 5.4.0-80-generic #90-Ubuntu SMP Fri Jul 9 22:49:44 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
</pre></details>

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ctr images export doesn't work #5895

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ctr images export doesn't work #5895

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