Fix SSH known_hosts configuration in GitLab CI

2 jobs from master in 11 seconds (queued for 1 second)
Status Job ID Name Coverage
  Deploy
failed #3930
jarvis
deploy_to_production

00:11

 
  Test
skipped #3931
jarvis
simple_test
 
[INFO] 🏥 项目目录: customer-recall
[INFO] 🗄️ 数据库: callback_system@localhost:3306
[INFO] 📁 创建备份目录...
[SUCCESS] 备份目录创建成功: /backup/database
[INFO] 💾 开始数据库备份...
[WARNING] mysqldump命令不存在,尝试使用Docker容器备份...
[INFO] 使用Docker容器备份数据库...
Error response from daemon: No such container: mysqldump
ERROR: Job failed: exit status 1