Add dismiss review feature (#12674)

* Add dismiss review feature

refs:
    https://github.blog/2016-10-12-dismissing-reviews-on-pull-requests/
    https://developer.github.com/v3/pulls/reviews/#dismiss-a-review-for-a-pull-request

* change modal ui and error message

* Add unDismissReview api

Signed-off-by: a1012112796 <1012112796@qq.com>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: 6543 <6543@obermui.de>

models/migrations/migrations.go

@@ -286,6 +286,8 @@ var migrations = []Migration{
 	NewMigration("Recreate user table to fix default values", recreateUserTableToFixDefaultValues),
 	// v169 -> v170
 	NewMigration("Update DeleteBranch comments to set the old_ref to the commit_sha", commentTypeDeleteBranchUseOldRef),
+	// v170 -> v171
+	NewMigration("Add Dismissed to Review table", addDismissedReviewColumn),
 }
 
 // GetCurrentDBVersion returns the current db version

models/migrations/v170.go

@@ -0,0 +1,22 @@
+// Copyright 2021 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 (
+	"fmt"
+
+	"xorm.io/xorm"
+)
+
+func addDismissedReviewColumn(x *xorm.Engine) error {
+	type Review struct {
+		Dismissed bool `xorm:"NOT NULL DEFAULT false"`
+	}
+
+	if err := x.Sync2(new(Review)); err != nil {
+		return fmt.Errorf("Sync2: %v", err)
+	}
+	return nil
+}