Add migrations tests (#34456) (#34483)

Backport #34456 by @lunny

Fix #34455

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

models/migrations/v1_23/v302_test.go

@@ -0,0 +1,51 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_23 //nolint
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/migrations/base"
+	"code.gitea.io/gitea/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 := base.PrepareTestEnv(t, 0, new(ActionTask))
+	defer deferable()
+
+	assert.NoError(t, AddIndexToActionTaskStoppedLogExpired(x))
+}