Show status check for merged PRs (#13975)

* Show status check for merged PRs

* Handle PRs with no commits

* Styling

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: 6543 <6543@obermui.de>

routers/repo/pull.go

@@ -325,6 +325,20 @@ func PrepareMergedViewPullInfo(ctx *context.Context, issue *models.Issue) *git.C
 	}
 	ctx.Data["NumCommits"] = compareInfo.Commits.Len()
 	ctx.Data["NumFiles"] = compareInfo.NumFiles
+
+	if compareInfo.Commits.Len() != 0 {
+		sha := compareInfo.Commits.Front().Value.(*git.Commit).ID.String()
+		commitStatuses, err := models.GetLatestCommitStatus(ctx.Repo.Repository.ID, sha, models.ListOptions{})
+		if err != nil {
+			ctx.ServerError("GetLatestCommitStatus", err)
+			return nil
+		}
+		if len(commitStatuses) != 0 {
+			ctx.Data["LatestCommitStatuses"] = commitStatuses
+			ctx.Data["LatestCommitStatus"] = models.CalcCommitStatus(commitStatuses)
+		}
+	}
+
 	return compareInfo
 }