I do have manifest.yml files which contain the attribute "path".
e.g "path: web"

Additionally I configured the cf plugin to read the manifest from gitRepo/manifest.yml.

Now pushing applications fails:
ERROR: Could not find file: /home/hudson/workspace/<jobname>/web (No such file or directory)

Which is true because the path need to be evaluated relative to the manifest.yml file which would be:
/home/hudson/workspace/<jobname>/gitRepo/web