Like anything else I run - on a Docker container, in my CapRover cluster of 7 services, all running on a single Hetzner VPS for $5/month.
I'm sure some people will now say things like Fly or Railway but curious to know firsthand.
Personally I'm still using DigitalOcean, I git pull, compile from source and run the Go binary, occassionally with a shell script. It's fronted by nginx and certbot/letsencrypt. That's it. For some reason I wish this was some simple solution instead of the endless variety of hosting out there. I always worry about Fly, Railway or someone else going out of business. I find other tools really complicated, and dedicated app hosting too expensive. A VM plus some open source works well. But I guess when you offloading that hosting to someone else you start expecting all sorts of tools. Maybe if there was just a dedicated CLI based thing. Who knows.