vendor: update buildkit to v0.8

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

vendor/github.com/moby/buildkit/solver/errdefs/solve.go

@@ -0,0 +1,74 @@
+package errdefs
+
+import (
+	"bytes"
+	"errors"
+
+	"github.com/containerd/typeurl"
+	"github.com/golang/protobuf/jsonpb"
+	"github.com/moby/buildkit/solver/pb"
+	"github.com/moby/buildkit/util/grpcerrors"
+)
+
+func init() {
+	typeurl.Register((*Solve)(nil), "github.com/moby/buildkit", "errdefs.Solve+json")
+}
+
+//nolint:golint
+type IsSolve_Subject isSolve_Subject
+
+// SolveError will be returned when an error is encountered during a solve that
+// has an exec op.
+type SolveError struct {
+	Solve
+	Err error
+}
+
+func (e *SolveError) Error() string {
+	return e.Err.Error()
+}
+
+func (e *SolveError) Unwrap() error {
+	return e.Err
+}
+
+func (e *SolveError) ToProto() grpcerrors.TypedErrorProto {
+	return &e.Solve
+}
+
+func WithSolveError(err error, subject IsSolve_Subject, inputIDs, mountIDs []string) error {
+	if err == nil {
+		return nil
+	}
+	var (
+		oe *OpError
+		op *pb.Op
+	)
+	if errors.As(err, &oe) {
+		op = oe.Op
+	}
+	return &SolveError{
+		Err: err,
+		Solve: Solve{
+			InputIDs: inputIDs,
+			MountIDs: mountIDs,
+			Op:       op,
+			Subject:  subject,
+		},
+	}
+}
+
+func (v *Solve) WrapError(err error) error {
+	return &SolveError{Err: err, Solve: *v}
+}
+
+func (v *Solve) MarshalJSON() ([]byte, error) {
+	m := jsonpb.Marshaler{}
+	buf := new(bytes.Buffer)
+	err := m.Marshal(buf, v)
+	return buf.Bytes(), err
+}
+
+func (v *Solve) UnmarshalJSON(b []byte) error {
+	return jsonpb.Unmarshal(bytes.NewReader(b), v)
+}