In order to share this plugin, I started a few Github repos (slurm-tmpdir and slurm-plugins-lua) for the plugin and dependencies. Next, I used Fedora's Copr build system to build a repo that I could share with others, the Slurm-Plugins repo.
Copr Slurm-Plugins Project
I'm sure that I don't have an exhaustive list of plugins in my repo. Actually, I only have one. But I can always add more by simply adding a Github repo.
Copr was very easy to use to build my packages, and it works for all OS's that I care about. I'm very happy with how Copr worked for sharing Nebraska's Slurm-Plugins.