Artifacts retention and auto clean up (#26131)

Currently, Artifact does not have an expiration and automatic cleanup
mechanism, and this feature needs to be added. It contains the following
key points:

- [x] add global artifact retention days option in config file. Default
value is 90 days.
- [x] add cron task to clean up expired artifacts. It should run once a
day.
- [x] support custom retention period from `retention-days: 5` in
`upload-artifact@v3`.
- [x] artifacts link in actions view should be non-clickable text when
expired.

models/migrations/v1_21/v274.go

@@ -0,0 +1,36 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_21 //nolint
+import (
+	"time"
+
+	"code.gitea.io/gitea/modules/timeutil"
+
+	"xorm.io/xorm"
+)
+
+func AddExpiredUnixColumnInActionArtifactTable(x *xorm.Engine) error {
+	type ActionArtifact struct {
+		ExpiredUnix timeutil.TimeStamp `xorm:"index"` // time when the artifact will be expired
+	}
+	if err := x.Sync(new(ActionArtifact)); err != nil {
+		return err
+	}
+	return updateArtifactsExpiredUnixTo90Days(x)
+}
+
+func updateArtifactsExpiredUnixTo90Days(x *xorm.Engine) error {
+	sess := x.NewSession()
+	defer sess.Close()
+
+	if err := sess.Begin(); err != nil {
+		return err
+	}
+	expiredTime := time.Now().AddDate(0, 0, 90).Unix()
+	if _, err := sess.Exec(`UPDATE action_artifact SET expired_unix=? WHERE status='2' AND expired_unix is NULL`, expiredTime); err != nil {
+		return err
+	}
+
+	return sess.Commit()
+}