The WebSphere container does not support WebSphere Application Server Community Edition, please prefer to use the "full" WebSphere package or WebSphere Application Server for Developers.
Thought the WebSphere container supports standalone local configurations, it is recommended for you to prefer using WebSphere with an existing local configuration; i.e. a WebSphere profile you would create beforehand using WebSphere's setup commands and then use that with Codehaus Cargo.
For installed container o.c.c.c.websphere.WebSphere85xInstalledLocalContainer