PigCI requires users add a gem to their Rails projects in order to help pass/fail pull requests.
It has taken a while, but I've just crossed over 2400 downloads (with over 1000 being from the latest version). It's pretty exciting to see that number climbing up.
One thing I've been doing to help promote it, is asking other developers I know personally to install it & give me some feedback. If they have something I can quickly get done, I try to make that change then let them know.
That said, I'm also discovering a lot of users really just want to use the as a standalone tool & don't want to have to install a GitHub app. I'm thinking I might change my focus away from being a GitHub integration & just focus on the gems functionality.