vendor: update buildkit to v0.19.0-rc1

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

vendor/k8s.io/kube-openapi/pkg/common/common.go

@@ -164,6 +164,9 @@ type OpenAPIV3Config struct {
 	// It is an optional function to customize model names.
 	GetDefinitionName func(name string) (string, spec.Extensions)
 
+	// PostProcessSpec runs after the spec is ready to serve. It allows a final modification to the spec before serving.
+	PostProcessSpec func(*spec3.OpenAPI) (*spec3.OpenAPI, error)
+
 	// SecuritySchemes is list of all security schemes for OpenAPI service.
 	SecuritySchemes spec3.SecuritySchemes
 

vendor/k8s.io/kube-openapi/pkg/schemaconv/smd.go

@@ -214,9 +214,6 @@ func makeUnion(extensions map[string]interface{}) (schema.Union, error) {
 		}
 	}
 
-	if union.Discriminator != nil && len(union.Fields) == 0 {
-		return schema.Union{}, fmt.Errorf("discriminator set to %v, but no fields in union", *union.Discriminator)
-	}
 	return union, nil
 }