util/imagetools: remove unused Resolver.ImageConfig

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

util/imagetools/inspect.go

@@ -15,9 +15,7 @@ import (
 	clitypes "github.com/docker/cli/cli/config/types"
 	"github.com/docker/distribution/reference"
 	"github.com/moby/buildkit/util/contentutil"
-	"github.com/moby/buildkit/util/imageutil"
 	"github.com/moby/buildkit/util/tracing"
-	"github.com/opencontainers/go-digest"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/sirupsen/logrus"
 )
@@ -162,11 +160,3 @@ func RegistryAuthForRef(ref string, a Auth) (string, error) {
 	}
 	return base64.URLEncoding.EncodeToString(buf), nil
 }
-
-func (r *Resolver) ImageConfig(ctx context.Context, in string, platform *ocispec.Platform) (digest.Digest, []byte, error) {
-	in, _, err := r.Resolve(ctx, in)
-	if err != nil {
-		return "", nil, err
-	}
-	return imageutil.Config(ctx, in, r.resolver(), r.buffer, nil, platform)
-}