Add build-docker-release to Makefile

Author: xiaozongyang

Makefile

@@ -11,6 +11,13 @@ build-docker:
 		-t xiaozongyang/kube-node-metrics:latest \
 		--push .
 
+.PHONY:
+build-docker-release:
+	$(eval TAG := $(shell git tag --points-at HEAD))
+	docker buildx build --platform linux/amd64,linux/arm64 \
+		-t xiaozongyang/kube-node-metrics:$(TAG) \
+		--push .
+
 .PHONY:
 clean:
 	rm kube-node-metrics