Move value of default clone image into shared constant package (#873)

shared/constant/constant.go

@@ -0,0 +1,27 @@
+// Copyright 2022 Woodpecker Authors
+//
+// 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 constant
+
+var PrivilegedPlugins = []string{
+	"plugins/docker",
+	"plugins/gcr",
+	"plugins/ecr",
+	"woodpeckerci/plugin-docker",
+	"woodpeckerci/plugin-docker-buildx",
+}
+
+const (
+	DefaultCloneImage = "docker.io/woodpeckerci/plugin-git:latest"
+)