Clean vendor dependencies

vendor/github.com/opencontainers/image-spec/specs-go/v1/index.go

@@ -1,29 +0,0 @@
-// Copyright 2016 The Linux Foundation
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package v1
-
-import "github.com/opencontainers/image-spec/specs-go"
-
-// Index references manifests for various platforms.
-// This structure provides `application/vnd.oci.image.index.v1+json` mediatype when marshalled to JSON.
-type Index struct {
-	specs.Versioned
-
-	// Manifests references platform specific manifests.
-	Manifests []Descriptor `json:"manifests"`
-
-	// Annotations contains arbitrary metadata for the image index.
-	Annotations map[string]string `json:"annotations,omitempty"`
-}