[arch-general] build and test packages automatically

Hello, I want to build an repository. I need a software to build and test packages automatically, and to show the status of all packages which is just like the buildd http://www.debian.org/devel/buildd/ in Debian. I have been looking for it via Google, but nothing found. Can anybody give me some advice? I also wonder what software is used by official developers to manage the main repository. Thanks, Guangyu