Add Docker build capability (#9128)

* Add Dockerfile and make commands

* add background run option

* Expand on OSS attribution in new Dockerfile

* Begin adding README instructions for Docker

* Add new stage command

Makefile

@@ -1,3 +1,8 @@
+DOCKER       = docker
+HUGO_VERSION = 0.40.3
+DOCKER_IMAGE = kubernetes-hugo
+DOCKER_RUN   = $(DOCKER) run --rm --interactive --tty --volume $(PWD):/src
+
 .PHONY: all build sass build-preview help serve
 
 help: ## Show this help.
@@ -18,5 +23,11 @@ build-preview: ## Build site with drafts and future posts enabled.
 serve: ## Boot the development server.
 	hugo server
 
-stage: ## This needs to be updated for Hugo
-	#docker run -ti --rm -v "${PWD}":/k8sdocs -p 4000:4000 gcr.io/google-samples/k8sdocs:1.1
+docker-image:
+	$(DOCKER) build . --tag $(DOCKER_IMAGE) --build-arg HUGO_VERSION=$(HUGO_VERSION)
+
+docker-build:
+	$(DOCKER_RUN) $(DOCKER_IMAGE) hugo
+
+stage:
+	$(DOCKER_RUN) -p 1313:1313 $(DOCKER_IMAGE) hugo server --watch --bind 0.0.0.0