Add ReviewedOnTrailer/ReviewedByTrailer to merge message template vars

docs/content/usage/merge-message-templates.en-us.md

@@ -44,6 +44,8 @@ You can use the following variables enclosed in `${}` inside these templates whi
 - PullRequestIndex: Pull request's index number
 - PullRequestReference: Pull request's reference char with index number. i.e. #1, !2
 - ClosingIssues: return a string contains all issues which will be closed by this pull request i.e. `close #1, close #2`
+- ReviewedOnTrailer: Message trailer including pull request URL, i.e. `Reviewed-on: https://gitea.com/foo/bar/pulls/1`
+- ReviewedByTrailer: Message trailer including pull request approvers, i.e.,`Reviewed-by: Jane Doe <[email protected]>`
 
 ## Rebase
 

services/pull/merge.go

@@ -80,6 +80,8 @@ func getMergeMessage(ctx context.Context, baseGitRepo *git.Repository, pr *issue
 				"PullRequestPosterName":  pr.Issue.Poster.Name,
 				"PullRequestIndex":       strconv.FormatInt(pr.Index, 10),
 				"PullRequestReference":   fmt.Sprintf("%s%d", issueReference, pr.Index),
+				"ReviewedOnTrailer":      reviewedOnTrailer,
+				"ReviewedByTrailer":      reviewedByTrailer,
 			}
 			if pr.HeadRepo != nil {
 				vars["HeadRepoOwnerName"] = pr.HeadRepo.OwnerName