Expose image variant

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

manifest/docker_schema2.go

@@ -120,6 +120,8 @@ type Schema2V1Image struct {
 	Config *Schema2Config `json:"config,omitempty"`
 	// Architecture is the hardware that the image is build and runs on
 	Architecture string `json:"architecture,omitempty"`
+	// Variant is a variant of the CPU that the image is build and runs on
+	Variant string `json:"variant,omitempty"`
 	// OS is the operating system used to build and run the image
 	OS string `json:"os,omitempty"`
 	// Size is the total size of the image including all layers it is composed of
@@ -330,6 +332,7 @@ func (m *Schema2) Inspect(configGetter func(types.BlobInfo) ([]byte, error)) (*t
 		Created:       &s2.Created,
 		DockerVersion: s2.DockerVersion,
 		Architecture:  s2.Architecture,
+		Variant:       s2.Variant,
 		Os:            s2.OS,
 		Layers:        layerInfosToStrings(m.LayerInfos()),
 	}

types/types.go

@@ -444,6 +444,7 @@ type ImageInspectInfo struct {
 	DockerVersion string
 	Labels        map[string]string
 	Architecture  string
+	Variant       string
 	Os            string
 	Layers        []string
 	Env           []string