Add debug output to know when linting has finished

Makefile

@@ -119,6 +119,7 @@ lint: lint.check ## run golangci-lint
 		echo -e "\033[0;33mgolangci-lint failed: some checks can be fixed with \`\033[0;32mmake fmt\033[0m\033[0;33m\`\033[0m"; \
 		exit 1; \
 	fi
+	@$(OK) Finished linting
 
 fmt: lint.check ## ensure consistent code style
 	@go mod tidy