Move `gitea-vet` to use `go tool` (#35878)

Add it as a [tool
dependency](https://go.dev/doc/modules/managing-dependencies#tools),
eliminating the need for `build.go`.

.github/labeler.yml

@@ -51,7 +51,6 @@ modifies/internal:
           - ".github/**"
           - ".gitea/**"
           - ".devcontainer/**"
-          - "build.go"
           - "build/**"
           - "contrib/**"
 

Makefile

@@ -386,8 +386,7 @@ lint-go-windows:
 .PHONY: lint-go-gitea-vet
 lint-go-gitea-vet: ## lint go files with gitea-vet
 	@echo "Running gitea-vet..."
-	@GOOS= GOARCH= $(GO) build code.gitea.io/gitea-vet
-	@$(GO) vet -vettool=gitea-vet ./...
+	@$(GO) vet -vettool="$(shell GOOS= GOARCH= go tool -n gitea-vet)" ./...
 
 .PHONY: lint-go-gopls
 lint-go-gopls: ## lint go files with gopls

build.go

@@ -1,14 +0,0 @@
-// Copyright 2020 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-//go:build vendor
-
-package main
-
-// Libraries that are included to vendor utilities used during Makefile build.
-// These libraries will not be included in a normal compilation.
-
-import (
-	// for vet
-	_ "code.gitea.io/gitea-vet"
-)

go.mod

@@ -9,7 +9,6 @@ godebug x509negativeserial=1
 
 require (
 	code.gitea.io/actions-proto-go v0.4.1
-	code.gitea.io/gitea-vet v0.2.3
 	code.gitea.io/sdk/gitea v0.22.0
 	codeberg.org/gusted/mcaptcha v0.0.0-20220723083913-4f3072e1d570
 	connectrpc.com/connect v1.18.1
@@ -135,6 +134,7 @@ require (
 
 require (
 	cloud.google.com/go/compute/metadata v0.8.0 // indirect
+	code.gitea.io/gitea-vet v0.2.3 // indirect
 	dario.cat/mergo v1.0.2 // indirect
 	filippo.io/edwards25519 v1.1.0 // indirect
 	git.sr.ht/~mariusor/go-xsd-duration v0.0.0-20220703122237-02e73435a078 // indirect
@@ -307,3 +307,5 @@ exclude github.com/gofrs/uuid v4.0.0+incompatible
 exclude github.com/goccy/go-json v0.4.11
 
 exclude github.com/satori/go.uuid v1.2.0
+
+tool code.gitea.io/gitea-vet