fix: fix get diffid blob not found

If the cache is hit during image conversion,  we need to add an uncompressed label to the Info method, otherwise containerd will attempt to update the cache layer label, resulting in error not found

Signed-off-by: YuQiang <y_q_email@163.com>

pkg/content/content.go

@@ -25,6 +25,7 @@ import (
 	ctrcontent "github.com/containerd/containerd/content"
 	"github.com/containerd/containerd/content/local"
 	"github.com/containerd/containerd/errdefs"
+	"github.com/containerd/containerd/labels"
 	"github.com/containerd/containerd/leases"
 	"github.com/containerd/containerd/metadata"
 	"github.com/containerd/containerd/metadata/boltutil"
@@ -253,6 +254,10 @@ func (content *Content) Info(ctx context.Context, dgst digest.Digest) (ctrconten
 				layers := remoteCache.Values()
 				for _, layer := range layers {
 					if layer.Digest == dgst {
+						if layer.Annotations == nil {
+							layer.Annotations = map[string]string{}
+						}
+						layer.Annotations[labels.LabelUncompressed] = layer.Digest.String()
 						return ctrcontent.Info{
 							Digest: layer.Digest,
 							Size:   layer.Size,