Add global lock for migrations to make upgrade more safe with multiple replications (#33706)

services/versioned_migration/migration.go

@@ -0,0 +1,24 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package versioned_migration //nolint
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/migrations"
+	"code.gitea.io/gitea/modules/globallock"
+
+	"xorm.io/xorm"
+)
+
+func Migrate(ctx context.Context, x *xorm.Engine) error {
+	// only one instance can do the migration at the same time if there are multiple instances
+	release, err := globallock.Lock(ctx, "gitea_versioned_migration")
+	if err != nil {
+		return err
+	}
+	defer release()
+
+	return migrations.Migrate(x)
+}