refactor: prepare to decouple the "model migration" package and "models" package (#38533)

Migrations should never use model structs directly, because the model
structs can be different in different releases. e.g. if one migration uses
"User" model, it works in the early releases, then one day, when the
User model changes, the migration breaks because it will use the
new (incorrect) User model, it should only use the old User model.

The same to "modules/structs".

---------

Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: delvh <dev.lh@web.de>

modelmigration/v1_23/v302_test.go

@@ -0,0 +1,51 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_23
+
+import (
+	"testing"
+
+	"gitea.dev/modelmigration/migrationtest"
+	"gitea.dev/modules/timeutil"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_AddIndexToActionTaskStoppedLogExpired(t *testing.T) {
+	type ActionTask struct {
+		ID       int64
+		JobID    int64
+		Attempt  int64
+		RunnerID int64              `xorm:"index"`
+		Status   int                `xorm:"index"`
+		Started  timeutil.TimeStamp `xorm:"index"`
+		Stopped  timeutil.TimeStamp `xorm:"index(stopped_log_expired)"`
+
+		RepoID            int64  `xorm:"index"`
+		OwnerID           int64  `xorm:"index"`
+		CommitSHA         string `xorm:"index"`
+		IsForkPullRequest bool
+
+		Token          string `xorm:"-"`
+		TokenHash      string `xorm:"UNIQUE"` // sha256 of token
+		TokenSalt      string
+		TokenLastEight string `xorm:"index token_last_eight"`
+
+		LogFilename  string  // file name of log
+		LogInStorage bool    // read log from database or from storage
+		LogLength    int64   // lines count
+		LogSize      int64   // blob size
+		LogIndexes   []int64 `xorm:"LONGBLOB"`                   // line number to offset
+		LogExpired   bool    `xorm:"index(stopped_log_expired)"` // files that are too old will be deleted
+
+		Created timeutil.TimeStamp `xorm:"created"`
+		Updated timeutil.TimeStamp `xorm:"updated index"`
+	}
+
+	// Prepare and load the testing database
+	x, deferable := migrationtest.PrepareTestEnv(t, 0, new(ActionTask))
+	defer deferable()
+
+	assert.NoError(t, AddIndexToActionTaskStoppedLogExpired(x))
+}