Update makefile.

Makefile

@@ -1,19 +1,23 @@
 GIT_SUMMARY := $(shell git describe --tags --dirty --always)
 REPO=msoedov/hacker-slides
-
+DOCKER_IMAGE := $(REPO):$(GIT_SUMMARY)
 default: repo
 
 repo:
-	@echo $(REPO):$(GIT_SUMMARY)
+	@echo $(DOCKER_IMAGE)
 
 build:
 	@GOOS=linux CGO_ENABLE=0 go build main.go
-	@docker build -t $(REPO):$(GIT_SUMMARY) .
-	@docker tag $(REPO):$(GIT_SUMMARY) $(REPO)
+	@docker build -t $(DOCKER_IMAGE) .
+	@docker tag $(DOCKER_IMAGE) $(REPO)
 
 push:
-	@docker push $(REPO):$(GIT_SUMMARY)
+	@docker push $(DOCKER_IMAGE)
 	@docker push $(REPO)
 
 r:
-	@docker run -it -p 8080:8080 $(REPO):$(GIT_SUMMARY)
+	@docker run -it -p 8080:8080 $(DOCKER_IMAGE)
+
+release:
+	@build
+	@push