While I really like arch, I don't think it's a good distro to be running apps directly on due to the rolling release nature. It's better to run apps directly in a distro like Debian or alpine. Yes, running the apps in a container will bring more stability and reliability, but you're still risking botched updates to the host that could cause instability.

That being said, your immediate best move would be to use docker. Your best move long term is to move to a distribution thats not rolling release.

Try lidarr on steroids. It integrates with deemix.