Add gitea-vet (#121)

Close #119

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: jolheiser <john.olheiser@gmail.com>
Reviewed-on: https://gitea.com/gitea/tea/pulls/121
Reviewed-by: John Olheiser <john.olheiser@gmail.com>
Reviewed-by: Andrew Thornton <art27@cantab.net>

vendor/gitea.com/jolheiser/gitea-vet/main.go

@@ -0,0 +1,17 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"gitea.com/jolheiser/gitea-vet/checks"
+	"golang.org/x/tools/go/analysis/unitchecker"
+)
+
+func main() {
+	unitchecker.Main(
+		checks.Imports,
+		checks.License,
+	)
+}