vendor: update buildkit to master@ae9d0f5

Signed-off-by: Justin Chadwell <me@jedevc.com>

vendor/github.com/moby/buildkit/frontend/gateway/client/attestation.go

@@ -0,0 +1,46 @@
+package client
+
+import (
+	pb "github.com/moby/buildkit/frontend/gateway/pb"
+	"github.com/moby/buildkit/solver/result"
+)
+
+func AttestationToPB(a *result.Attestation) (*pb.Attestation, error) {
+	subjects := make([]*pb.InTotoSubject, len(a.InToto.Subjects))
+	for i, subject := range a.InToto.Subjects {
+		subjects[i] = &pb.InTotoSubject{
+			Kind:   subject.Kind,
+			Name:   subject.Name,
+			Digest: subject.Digest,
+		}
+	}
+
+	return &pb.Attestation{
+		Kind:                a.Kind,
+		Path:                a.Path,
+		Ref:                 a.Ref,
+		InTotoPredicateType: a.InToto.PredicateType,
+		InTotoSubjects:      subjects,
+	}, nil
+}
+
+func AttestationFromPB(a *pb.Attestation) (*result.Attestation, error) {
+	subjects := make([]result.InTotoSubject, len(a.InTotoSubjects))
+	for i, subject := range a.InTotoSubjects {
+		subjects[i] = result.InTotoSubject{
+			Kind:   subject.Kind,
+			Name:   subject.Name,
+			Digest: subject.Digest,
+		}
+	}
+
+	return &result.Attestation{
+		Kind: a.Kind,
+		Path: a.Path,
+		Ref:  a.Ref,
+		InToto: result.InTotoAttestation{
+			PredicateType: a.InTotoPredicateType,
+			Subjects:      subjects,
+		},
+	}, nil
+}