Update Makefile

Author: sysulq

Makefile

@@ -44,7 +44,7 @@ docker:
 
 push:
 	@echo ">> pushing docker image, $(DOCKER_USER),$(DOCKER_IMAGE_NAME),$(TAG)"
-	@docker login -u $(DOCKER_USER) -p $(DOCKER_PASS)
+	@echo $DOCKER_PASSWORD | docker login -u "$DOCKER_USERNAME" --password-stdin
 	@docker tag "$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" "$(DOCKER_USER)/$(DOCKER_IMAGE_NAME):$(TAG)"
 	@docker push "$(DOCKER_USER)/$(DOCKER_IMAGE_NAME):$(TAG)"
 
@@ -63,4 +63,4 @@ github-release:
 		GOARCH=$(subst x86_64,amd64,$(patsubst i%86,386,$(shell uname -m))) \
 		$(GO) get -u github.com/aktau/github-release
 
-.PHONY: all style format build test vet tarball docker promu
+.PHONY: all style format build test vet tarball docker promu