Just use our (un)patented Clone-And-DotCloud-Push method:
git clone git://github.com/jpetazzo/jenkins-on-dotcloud.git dotcloud push jenkins jenkins-on-dotcloud
At the end of the push, the URL to Jenkins will be shown.
Add the dotcloud.yml supplied here to your own dotcloud.yml, and copy the jenkins directory to your repository as well. Push as usual. Enjoy Continuous Integration.