image: dedup same platform entry

[zhuangqh]

may got duplicate value from image.Platforms interface.
we should duplicate them like ctr do

Signed-off-by: zhuangqh zhuangqhc@gmail.com

[AkihiroSuda]

How to repro the issue?

[zhuangqh]

How to repro the issue?

when listing image which was generated from criu checkpoint. see containerd/containerd#9081

[AkihiroSuda]

Windows test is failing

=== CONT  TestImagesWithNames
    image_list_test.go:36: assertion failed: 
        Command:  C:\Users\runneradmin\go\bin\nerdctl.exe --namespace=nerdctl-test images --names gcr.io/k8s-staging-e2e-test-images/busybox:1.29-2
        ExitCode: 0
        Stdout:   NAME    IMAGE ID    CREATED    PLATFORM    SIZE    BLOB SIZE
        
        Stderr:   
        
        Failures:
        Expected stdout to contain "gcr.io/k8s-staging-e2e-test-images/busybox:1.29-2"
--- FAIL: TestImagesWithNames (0.55s)

https://github.com/containerd/nerdctl/actions/runs/6146430040/job/16700918243?pr=2486

[AkihiroSuda]

Thanks

[zhuangqh]

@AkihiroSuda I have no idea whether to dudup inside the image.Platform() implementation or here. What do you recommend

[AkihiroSuda]

@AkihiroSuda I have no idea whether to dudup inside the image.Platform() implementation or here. What do you recommend

Ideally deduplication should happen in image.Platform()

[zhuangqh]

ok, I'm committing changes to the upstream containerd repository. So hold this pr, thanks

[zhuangqh]

Still dedup here as a workaround, see containerd/containerd#9081 (comment)
thanks @AkihiroSuda

[AkihiroSuda]

Thanks, merged