Added Description Field for Secrets and Variables (#33526)

Fixes #33484

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

models/migrations/v1_24/v316.go

@@ -0,0 +1,20 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_24 //nolint
+
+import (
+	"xorm.io/xorm"
+)
+
+func AddDescriptionForSecretsAndVariables(x *xorm.Engine) error {
+	type Secret struct {
+		Description string `xorm:"TEXT"`
+	}
+
+	type ActionVariable struct {
+		Description string `xorm:"TEXT"`
+	}
+
+	return x.Sync(new(Secret), new(ActionVariable))
+}