Add resource type for registry-image-forked to windows staging pipeline (#1331)

* Update windows staging pipeline to use forked registry image

Incorrectly passed in values in previous config, so it wasn't using workload ID

* Add resource type for registry-image-forked

Author: jjerger

concourse/pipelines/windows-image-build-staging.jsonnet

@@ -640,6 +640,11 @@ local ImgGroup(name, images) = {
       source: { repository: 'frodenas/gcs-resource' },
       type: 'registry-image',
     },
+    {
+      name: 'registry-image-forked',
+      type: 'registry-image',
+      source: { repository: 'gcr.io/compute-image-tools/registry-image-forked' },
+    },
   ],
   resources: [
                common.GitResource('compute-image-tools'),