Dokku Maintainer here:
We don't currently have RPM packages, nor any real plans to do so. None of the maintainers run RPM-based distributions, though we're not opposed to supporting them. As far as I know, there are a few places where we install packages from the OS repository, and it should be possible to find alternatives for those such that source-based installation works. This is how our experimental SUSE-support works, and we'd be happy to take any patches for this.
We currently officially support Debian 8.2+ and Ubuntu 14.04+ systems, so anything with systemd or upstart as it's init system will work fine. If you'd like to create an
rpm.mk which has make targets for building RPM packages for
dokku, that would also allow us to build official packages for that system.
The other option is a dockerfile-based deploy of dokku, which is currently being worked on in #1076. I'm not sure when that will land in master, as there hasn't been any movement outside of my own in a few months.
All that said, given your company's requirements, perhaps openshift is your current best bet? Here is a list of container managers you can use, one of which may also be sufficient for your needs.
If you'd like to sponsor the work, I'd also be glad to prioritize RPM support. You can contact me at the email in my github account.