Add block on official review requests branch protection (#13705)

Signed-off-by: a1012112796 <1012112796@qq.com>

Co-authored-by: Lauris BH <lauris@nix.lv>

models/migrations/v160.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 migrations
+
+import (
+	"xorm.io/xorm"
+)
+
+func addBlockOnOfficialReviewRequests(x *xorm.Engine) error {
+	type ProtectedBranch struct {
+		BlockOnOfficialReviewRequests bool `xorm:"NOT NULL DEFAULT false"`
+	}
+
+	return x.Sync2(new(ProtectedBranch))
+}