Add GCR build

Makefile

@@ -87,6 +87,10 @@ clean:
 	rm -rf release
 	rm -rf build
 
+.PHONY: gcr-build
+gcr-build:
+	docker build -t gcr.io/$(DOCKER_IMAGE_NAME):$(VERSION) -f Dockerfile.ci .
+
 .PHONY: test
 test:
 	cd pkg/server ; go test -v -race ./...

cloudbuild.yaml

@@ -0,0 +1,4 @@
+steps:
+- name: 'gcr.io/cloud-builders/docker'
+  args: ['build','-f' , 'Dockerfile.ci', '-t', 'gcr.io/$PROJECT_ID/podinfo:$COMMIT_SHA', '.']
+images: ['gcr.io/$PROJECT_ID/podinfo:$COMMIT_SHA']