image list: remove unused ConfigDigest

Remove the `ConfigDigest` field from `entities.ImageSummary` which has
never been populated (or documented) until now.  Unless there is a
specific request or need to support it, remove the TODO that was added
during the libimage migration.

Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>

pkg/domain/entities/images.go

@@ -68,7 +68,6 @@ type ImageSummary struct {
 	// Podman extensions
 	Names        []string `json:",omitempty"`
 	Digest       string   `json:",omitempty"`
-	ConfigDigest string   `json:",omitempty"`
 	History      []string `json:",omitempty"`
 }
 

pkg/domain/infra/abi/images_list.go

@@ -37,8 +37,6 @@ func (ir *ImageEngine) List(ctx context.Context, opts entities.ImageListOptions)
 
 		e := entities.ImageSummary{
 			ID: img.ID(),
-			// TODO: libpod/image didn't set it but libimage should
-			// ConfigDigest: string(img.ConfigDigest),
 			Created:     img.Created().Unix(),
 			Dangling:    isDangling,
 			Digest:      string(img.Digest()),