vendor: update buildkit to 93b40706a007

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

vendor/github.com/moby/buildkit/exporter/containerimage/exptypes/parse.go

@@ -0,0 +1,56 @@
+package exptypes
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/containerd/containerd/platforms"
+	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
+	"github.com/pkg/errors"
+)
+
+func ParsePlatforms(meta map[string][]byte) (Platforms, error) {
+	if platformsBytes, ok := meta[ExporterPlatformsKey]; ok {
+		var ps Platforms
+		if len(platformsBytes) > 0 {
+			if err := json.Unmarshal(platformsBytes, &ps); err != nil {
+				return Platforms{}, errors.Wrapf(err, "failed to parse platforms passed to provenance processor")
+			}
+		}
+		return ps, nil
+	}
+
+	p := platforms.DefaultSpec()
+	if imgConfig, ok := meta[ExporterImageConfigKey]; ok {
+		var img ocispecs.Image
+		err := json.Unmarshal(imgConfig, &img)
+		if err != nil {
+			return Platforms{}, err
+		}
+
+		if img.OS != "" && img.Architecture != "" {
+			p = ocispecs.Platform{
+				Architecture: img.Architecture,
+				OS:           img.OS,
+				OSVersion:    img.OSVersion,
+				OSFeatures:   img.OSFeatures,
+				Variant:      img.Variant,
+			}
+		}
+	}
+	p = platforms.Normalize(p)
+	pk := platforms.Format(p)
+	ps := Platforms{
+		Platforms: []Platform{{ID: pk, Platform: p}},
+	}
+	return ps, nil
+}
+
+func ParseKey(meta map[string][]byte, key string, p Platform) []byte {
+	if v, ok := meta[fmt.Sprintf("%s/%s", key, p.ID)]; ok {
+		return v
+	} else if v, ok := meta[key]; ok {
+		return v
+	}
+	return nil
+}