[cri] add image-name annotation

For some tools having the actual image name in the annotations is helpful for
debugging and auditing the workload.

Signed-off-by: Michael Crosby <michael@thepasture.io>

pkg/cri/annotations/annotations.go

@@ -53,4 +53,6 @@ const (
 
 	// ContainerName is the name of the container in the pod
 	ContainerName = "io.kubernetes.cri.container-name"
+	// ImageName is the name of the image used to create the container
+	ImageName = "io.kubernetes.cri.image-name"
 )