Please, Dockerize your application. Or give me some way of starting a full copy of your app with one command (and without touching the rest of my system).

I want to help, but if standing up your app means installing a new programming language and a new package manager and a bunch of dependencies and configuring your application and reconfiguring my web server—and then I have to figure out how to actually fix the bug—I’m going to be a lot less likely to contribute to your project.

I suppose some projects have convoluted setup processes to discourage just these kinds of drive-by PRs from people who don’t know the code that well. But I don’t think that’s the reason most projects take a while to get running.