chore: add help Make target

GNUmakefile

@@ -2,37 +2,40 @@ TIMEOUT ?= 30s
 
 default: test lint
 
-cleantidy:
+cleantidy: ## Tidy go modules
 	@echo "make: tidying Go mods..."
 	@cd tools && go mod tidy && cd ..
 	@cd v2/awsv1shim && go mod tidy && cd ../..
 	@go mod tidy
 	@echo "make: Go mods tidied"
 
-fmt:
+fmt: ## Run gofmt
 	gofmt -s -w ./
 
-gen:
+gen: ## Run generators
 	@echo "make: Running Go generators..."
 	@go generate ./...
 
-golangci-lint:
+golangci-lint: ## Run golangci-lint
 	@golangci-lint run ./...
 	@cd v2/awsv1shim && golangci-lint run ./...
 
-importlint:
+help: ## Display this help
+	@grep -E '^[a-zA-Z0-9_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-13s\033[0m %s\n", $$1, $$2}'
+
+importlint: ## Lint imports
 	@impi --local . --scheme stdThirdPartyLocal ./...
 
-lint: golangci-lint importlint
+lint: golangci-lint importlint ## Run all linters
 
-semgrep:
+semgrep: ## Run semgrep checks
 	@docker run --rm --volume "${PWD}:/src" returntocorp/semgrep semgrep --config .semgrep --no-rewrite-rule-ids
 
-test:
+test: ## Run unit tests
 	go test -timeout=$(TIMEOUT) -parallel=4 ./...
 	cd v2/awsv1shim && go test -timeout=$(TIMEOUT) -parallel=4 ./...
 
-tools:
+tools: ## Install tools
 	cd tools && go install github.com/golangci/golangci-lint/cmd/golangci-lint
 	cd tools && go install github.com/pavius/impi/cmd/impi
 
@@ -42,8 +45,9 @@ tools:
 	fmt \
 	gen \
 	golangci-lint \
+	help \
 	importlint \
 	lint \
 	test \
 	test \
-	tools \
+	tools \