Add synchronous image delete

Synchronous image delete provides an option image delete to wait
until the next garbage collection deletes after an image is removed
before returning success to the caller.

Signed-off-by: Derek McGowan <derek@mcgstyle.net>

images/image.go

@@ -38,6 +38,23 @@ type Image struct {
 	CreatedAt, UpdatedAt time.Time
 }
 
+// DeleteOptions provide options on image delete
+type DeleteOptions struct {
+	Synchronous bool
+}
+
+// DeleteOpt allows configuring a delete operation
+type DeleteOpt func(context.Context, *DeleteOptions) error
+
+// SynchronousDelete is used to indicate that an image deletion and removal of
+// the image resources should occur synchronously before returning a result.
+func SynchronousDelete() DeleteOpt {
+	return func(ctx context.Context, o *DeleteOptions) error {
+		o.Synchronous = true
+		return nil
+	}
+}
+
 // Store and interact with images
 type Store interface {
 	Get(ctx context.Context, name string) (Image, error)
@@ -48,7 +65,7 @@ type Store interface {
 	// one or more fieldpaths are provided, only those fields will be updated.
 	Update(ctx context.Context, image Image, fieldpaths ...string) (Image, error)
 
-	Delete(ctx context.Context, name string) error
+	Delete(ctx context.Context, name string, opts ...DeleteOpt) error
 }
 
 // TODO(stevvooe): Many of these functions make strong platform assumptions,