add push make targets for images

06-building-container-images/api-golang/Makefile

@@ -1,12 +1,26 @@
 API_GOLANG_PATH:=../../05-example-web-application/api-golang/
+DOCKERHUB_REPO:=sidpalas/devops-directive-docker-course-api-golang
 
 N?=0
 .PHONY: build-N
 build-N:
-	docker build --file ./Dockerfile.$(N) -t api-golang:$(N) ${API_GOLANG_PATH}
+	docker build --file ./Dockerfile.${N} \
+		-t api-golang:${N} \
+		-t ${DOCKERHUB_REPO}:${N} \
+		${API_GOLANG_PATH}
 
 .PHONY: build-all
 build-all:
 	for number in 0 1 2 3 4 5 6 ; do \
 			N=$$number $(MAKE) build-N; \
-	done
+	done
+
+.PHONY: push-N
+push-N:
+	docker push ${DOCKERHUB_REPO}:${N}
+
+.PHONY: push-all
+push-all:
+	for number in 0 1 2 3 4 5 6 ; do \
+			N=$$number $(MAKE) push-N; \
+	done