Added Makefile for multi-arch builds

Makefile

@@ -0,0 +1,24 @@
+DOCKER_TAG := chewingbever/blog:latest
+
+all: build
+.PHONY: build
+
+build:
+	@ hugo
+.PHONY: build
+
+run:
+	@ hugo -D server
+.PHONY: run
+
+image:
+	@ docker build -t ${DOCKER_TAG} .
+.PHONY: image
+
+publish:
+	@ docker buildx build . \
+		--platform linux/amd64,linux/arm64 \
+		-t ${DOCKER_TAG} \
+		--pull \
+		--push
+.PHONY: publish