Display when a repo was archived (#22664)

This adds the date a repo is archived to Gitea and shows it in the UI
and API. A feature, that GitHub has been [introduced
recently](https://github.blog/changelog/2022-11-23-repository-archive-date-now-shown-in-ui/).

I currently don't know how to correctly deal with the Date in the
template, as different languages have different ways of writing a date.


![grafik](https://user-images.githubusercontent.com/15185051/234315187-7db5763e-d96e-4080-b894-9be178bfb6e1.png)

---------

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

models/repo/archiver.go

@@ -146,6 +146,13 @@ func FindRepoArchives(opts FindRepoArchiversOption) ([]*RepoArchiver, error) {
 // SetArchiveRepoState sets if a repo is archived
 func SetArchiveRepoState(repo *Repository, isArchived bool) (err error) {
 	repo.IsArchived = isArchived
-	_, err = db.GetEngine(db.DefaultContext).Where("id = ?", repo.ID).Cols("is_archived").NoAutoTime().Update(repo)
+
+	if isArchived {
+		repo.ArchivedUnix = timeutil.TimeStampNow()
+	} else {
+		repo.ArchivedUnix = timeutil.TimeStamp(0)
+	}
+
+	_, err = db.GetEngine(db.DefaultContext).ID(repo.ID).Cols("is_archived", "archived_unix").NoAutoTime().Update(repo)
 	return err
 }

models/repo/repo.go

@@ -174,8 +174,9 @@ type Repository struct {
 	// Avatar: ID(10-20)-md5(32) - must fit into 64 symbols
 	Avatar string `xorm:"VARCHAR(64)"`
 
-	CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
-	UpdatedUnix timeutil.TimeStamp `xorm:"INDEX updated"`
+	CreatedUnix  timeutil.TimeStamp `xorm:"INDEX created"`
+	UpdatedUnix  timeutil.TimeStamp `xorm:"INDEX updated"`
+	ArchivedUnix timeutil.TimeStamp `xorm:"DEFAULT 0"`
 }
 
 func init() {