lint: add golangci-lint

Makefile

@@ -11,6 +11,8 @@ ZSH_COMPLETION := $(COMPLETIONS_DIR)/zsh
 INSTALLED_BASH_COMPLETION := $(DESTDIR)$(PREFIX)/share/bash-completion/completions/$(NAME)
 INSTALLED_ZSH_COMPLETION := $(DESTDIR)$(PREFIX)/share/zsh/site-functions/_$(NAME)
 
+GOLANGCI_LINT := go run github.com/golangci/golangci-lint/cmd/golangci-lint@v1.62.2
+
 .PHONY: build install clean clear uninstall check-no-root
 
 build: check-no-root $(BIN)
@@ -25,6 +27,10 @@ check-no-root:
 		exit 1; \
 	fi
 
+# TODO: remove --tests=false
+fmt:
+	$(GOLANGCI_LINT) run --fix --tests=false
+
 install: \
 	$(INSTALED_BIN) \
 	$(INSTALLED_BASH_COMPLETION) \