Merge pull request kubernetes#1264 from mrueg/makefile-cloudbuild

Makefile: Set tag via cloudbuild

Makefile

@@ -3,12 +3,12 @@ TESTENVVAR =
 REGISTRY ?= gcr.io/k8s-staging-kube-state-metrics
 TAG_PREFIX = v
 VERSION = $(shell cat VERSION)
-TAG = $(TAG_PREFIX)$(VERSION)
+TAG ?= $(TAG_PREFIX)$(VERSION)
 LATEST_RELEASE_BRANCH := release-$(shell grep -ohE "[0-9]+.[0-9]+" VERSION)
 DOCKER_CLI ?= docker
 PKGS = $(shell go list ./... | grep -v /vendor/ | grep -v /tests/e2e)
 ARCH ?= $(shell go env GOARCH)
-BuildDate = $(shell date -u +'%Y-%m-%dT%H:%M:%SZ')
+BUILD_DATE = $(shell date -u +'%Y-%m-%dT%H:%M:%SZ')
 GIT_COMMIT ?= $(shell git rev-parse --short HEAD)
 ALL_ARCH = amd64 arm arm64 ppc64le s390x
 PKG = k8s.io/kube-state-metrics/v2/pkg
@@ -54,7 +54,7 @@ doccheck: generate
 	@echo OK
 
 build-local:
-	GOOS=$(shell uname -s | tr A-Z a-z) GOARCH=$(ARCH) CGO_ENABLED=0 go build -ldflags "-s -w -X ${PKG}/version.Release=${TAG} -X ${PKG}/version.Commit=${GIT_COMMIT} -X ${PKG}/version.BuildDate=${BuildDate}" -o kube-state-metrics
+	GOOS=$(shell uname -s | tr A-Z a-z) GOARCH=$(ARCH) CGO_ENABLED=0 go build -ldflags "-s -w -X ${PKG}/version.Release=${TAG} -X ${PKG}/version.Commit=${GIT_COMMIT} -X ${PKG}/version.BuildDate=${BUILD_DATE}" -o kube-state-metrics
 
 build: kube-state-metrics
 

cloudbuild.yaml

@@ -6,7 +6,7 @@ steps:
   - name: 'gcr.io/k8s-testimages/gcb-docker-gcloud:v20190906-745fed4'
     entrypoint: make
     env:
-    - GIT_TAG=$_PULL_BASE_REF
+    - TAG=$_PULL_BASE_REF
     - GIT_COMMIT=$_PULL_BASE_SHA
     args:
     - push