Update imgutil to improve containerd storage driver performance (#2427)

* Update imgutil to improve containerd storage driver performance

- Always try the fast path first (omitting base layers) regardless of storage type. This greatly speeds up creating ephemeral builders in pack when it saves to the daemon.
- Added log lines around ephemeral builder creation to help show time spent.

Signed-off-by: Jesse Brown <jabrown85@gmail.com>

* fixup! Update imgutil to improve containerd storage driver performance

Signed-off-by: Jesse Brown <jabrown85@gmail.com>

---------

Signed-off-by: Jesse Brown <jabrown85@gmail.com>

Author: jabrown85

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/Masterminds/semver v1.5.0
 	github.com/Microsoft/go-winio v0.6.2
 	github.com/apex/log v1.9.0
-	github.com/buildpacks/imgutil v0.0.0-20250626173435-7c19c278f3d2
+	github.com/buildpacks/imgutil v0.0.0-20250814164739-4b1c8875ba7e
 	github.com/buildpacks/lifecycle v0.20.11
 	github.com/containerd/errdefs v1.0.0
 	github.com/docker/cli v28.3.3+incompatible

go.sum

@@ -94,8 +94,8 @@ github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
-github.com/buildpacks/imgutil v0.0.0-20250626173435-7c19c278f3d2 h1:31i47pC9YE898vRkFDlubgX9UwxSy8cX/YSXtfPcRLA=
-github.com/buildpacks/imgutil v0.0.0-20250626173435-7c19c278f3d2/go.mod h1:UH4th60x/wM1DdH7+eSgzbp0kgsJMhVgngWzXoF21cs=
+github.com/buildpacks/imgutil v0.0.0-20250814164739-4b1c8875ba7e h1:a+vpYYeK7E7+3uGqseiRutzKA7yNNjAOPON9+VOADiw=
+github.com/buildpacks/imgutil v0.0.0-20250814164739-4b1c8875ba7e/go.mod h1:UH4th60x/wM1DdH7+eSgzbp0kgsJMhVgngWzXoF21cs=
 github.com/buildpacks/lifecycle v0.20.11 h1:lr8smVyW59HvkdJj7H3rYbfiNT7ndkV4cV2lQiOnCuo=
 github.com/buildpacks/lifecycle v0.20.11/go.mod h1:+YlGlTCwJcyJSp5QvZKxH8k2JOpYzjTE9NYB6CA5CuE=
 github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8=

internal/builder/builder.go

@@ -652,7 +652,10 @@ func (b *Builder) Save(logger logging.Logger, creatorMetadata CreatorMetadata, a
 		return errors.Wrap(err, "failed to set working dir")
 	}
 
-	return b.image.Save(additionalTags...)
+	logger.Debugf("Builder creation completed, starting image save")
+	err = b.image.Save(additionalTags...)
+	logger.Debugf("Image save completed")
+	return err
 }
 
 // Helpers