Amend Makefile

Added --platform flag to enable M* machines to build images. Also added
descriptions to Makefile to increase visability.
ND-168

Makefile

@@ -2,25 +2,37 @@ ifneq (,$(wildcard ./.env))
 	include .env
 endif
 
-authenticate_docker:
+.DEFAULT_GOAL := help
+
+.PHONY: authenticate_docker
+authenticate_docker: ## Authenticate docker script
 	./scripts/authenticate_docker.sh
 
-build: authenticate_docker
-	docker build -t mojo-${ENV}-ima-blackbox-exporter .
+.PHONY: build
+build: ## Docker build image
+	$(MAKE) authenticate_docker
+	docker build --platform linux/amd64 -t mojo-${ENV}-ima-blackbox-exporter .
 
-publish: build
+.PHONY: publish
+publish: ## Docker build and deploy blackbox exporter repo
+	$(MAKE) build
 	ENV=${ENV} ./scripts/deploy.sh blackbox_exporter_repository_v2
 
-deploy:
+.PHONY: deploy
+deploy: ## Redeploy ecs-service
 	ENV=${ENV} ./scripts/restart_ecs_service.sh
 
-serve:
+.PHONY: serve
+serve: ## Run blackbox-exporter
 	docker run -d -p 9115:9115 --name blackbox-exporter mojo-${ENV}-ima-blackbox-exporter
 
-stop:
+.PHONY: stop
+stop: ## Stop blackbox-exporter container
 	docker container stop blackbox-exporter
 
-test:
+.PHONY: test
+test: ## Run tests
 	echo "No tests"
 
-.PHONY: build deploy serve test
+help:
+	@grep -h -E '^[a-zA-Z0-9_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'