fix(lint): extend manifest list linter to manifests #74
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Fixes an issue in which, even if we require support for multi-arch in our lint config, we would not catch the issue if we were passed a single-arch manifest. Fixes the issue by extending the
ContainerImageManifestListLinterand its lint rule implementations to also support being passed a manifest.For
ManifestListSupportsRequiredMediaTypes, it now supports a new config attribute calledallow-single-archwhich defaults toTrue. If true and passed a manifest, then it will just check the manifest media type. If false and passed a manifest, then it will return a lint error.For
ManifestListSupportsRequiredPlatforms, it simply checks the manifest's platform. TheContainerImageLinteralso passes in the manifest's config into this lint rule implementation when it is a single-arch manifest because that is where the platform metadata is stored.