[do not merge] test image-spec with embedded Platform

[thaJeztah]

• Testing the "embed_platform" branch from: Embed Platform in Image opencontainers/image-spec#949
• Relates to Fix several conversions of "ocispec.Image" to "ocispec.Platform" #7376 (comment)

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[thaJeztah]

Ah, yes, some changes needed if struct literals are used;

# github.com/containerd/containerd/integration/client [github.com/containerd/containerd/integration/client.test]
Error: .\import_test.go:386:3: unknown field 'OS' in struct literal of type "github.com/opencontainers/image-spec/specs-go/v1".Image
Error: .\import_test.go:387:3: unknown field 'Architecture' in struct literal of type "github.com/opencontainers/image-spec/specs-go/v1".Image

[tianon]

Suggested change

	// FIXME: testing "embed_platform" branch from https://github.com/opencontainers/image-spec/pull/949
	replace github.com/opencontainers/image-spec => github.com/thaJeztah/image-spec v1.0.2-0.20220908165244-ca2e500b1693

👀

[tianon]

I've rolled the updated version of this change into #7376, so unless @thaJeztah objects to what I've done, this is probably safe to close 👀

[thaJeztah]

superseded by #8498