alt Hacker News> Sure, maintenance is a thing, but honestly, flinging java, docker and a few other things onto a build agent isn't the time-consuming part of maintaining CI infrastructure.
Depending on your workplace, there's a whole extra layer of bureaucracy and compliance involved if you self-host things. I aggressively avoid managing any VMs for that reason alone.
Luckily, at work we are this layer of bureaucracy and compliance. I'm very much pushing the agenda and idea that managing a stateful, mutable linux VM is a complex skill on it's own and incurs toil that's both recurring and hard to automate. The best case to handle that is to place your use case into our config management and let us manage it.
Most modern development workflows should just pickup a host with some container engine and do their work in stateless containers with some external state mapped in, like package caches. It's much easier for both sides in a majority of cases.