Patch regsitry v2.7.1 with fix on distribution issue 2819

This commit is to build a regsitry bases on v2.7.1 code and introduces
an fix on issue goharbor#2819, this is a P0 bug on v2.7.1 which causes GCS doesn't
work well on v2.7.1

For more details, refer to distribution/distribution#2821

Signed-off-by: wang yan <wangyan@vmware.com>

Makefile

@@ -98,7 +98,7 @@ VERSIONFILENAME=UIVERSION
 PREPARE_VERSION_NAME=versions
 
 #versions
-REGISTRYVERSION=v2.7.1
+REGISTRYVERSION=v2.7.1-patch-2821
 NGINXVERSION=$(VERSIONTAG)
 NOTARYVERSION=v0.6.1
 CLAIRVERSION=v2.0.7

make/photon/registry/Dockerfile.binary

@@ -1,7 +1,7 @@
 FROM golang:1.11
 
 ENV DISTRIBUTION_DIR /go/src/github.com/docker/distribution
-ENV DOCKER_BUILDTAGS include_oss include_gcs
+ENV BUILDTAGS include_oss include_gcs
 
 WORKDIR $DISTRIBUTION_DIR
 COPY . $DISTRIBUTION_DIR