使用 CI 一段时间后，artifacts 占用的磁盘会很大，可以配置保留多少天的 artifacts，具体如下：
- Administration
- Click the Edit link for any of your branches or <root project>*
- Clean-up rules on left hand menu
- Under What to clean-up choose the Edit link.
- Under the Artifacts section, put a value in the box: Older than the []-th successful build.
REFER:
http://returnsmart.blogspot.com/2015/10/teamcity-how-to-clean-up-old-artifacts.html
https://stackoverflow.com/questions/9007366/team-city-artifact-limit