AWS弹性beanstalk：在部署时安装libreoffice

I need to have LibreOffice installed on my web server. Since I'm using autoscaling with AWS Elastic Beanstalk, I need to install it on deployment. To do so, I am using .ebextensions files, but can't get it to work. This is my config file in .ebextensions folder:I need to have LibreOffice installed on my web