add image user to inspect data

Signed-off-by: baude <bbaude@redhat.com>

Closes: #1036
Approved by: rhatdan

libpod/image/image.go

@@ -815,6 +815,7 @@ func (i *Image) Inspect(ctx context.Context) (*inspect.ImageData, error) {
 		},
 		GraphDriver:  driver,
 		ManifestType: manifestType,
+		User:         ociv1Img.Config.User,
 	}
 	return data, nil
 }

pkg/inspect/inspect.go

@@ -125,6 +125,7 @@ type ImageData struct {
 	Labels          map[string]string `json:"Labels"`
 	Annotations     map[string]string `json:"Annotations"`
 	ManifestType    string            `json:"ManifestType"`
+	User            string            `json:"User"`
 }
 
 // RootFS holds the root fs information of an image