[make] Add Makefile

Makefile

@@ -0,0 +1,25 @@
+.PHONY: default run fmt help
+
+default: help
+
+run: ## Run the program
+	go run server.go
+
+build: Dockerfile ## Build container image
+	@docker build . -t aeolyus/gull
+
+release: Dockerfile ## Build and push the container image for all platforms
+	@docker buildx build . \
+		-t aeolyus/gull \
+		-t ghcr.io/aeolyus/gull \
+		--platform linux/arm,linux/arm64,linux/amd64 \
+		--push
+
+fmt: ## Format the code
+	go fmt ./...
+
+help: Makefile ## Print this help
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) \
+		| sort \
+		| awk 'BEGIN {FS = ":.*?## "}; \
+		{printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'