Heroku requires a monthly fee. Why not run your own cookie server?
There's lots of option to run in a container on a NAS, docker install, Linux VM, RPi, etc.
Unfortunately, I don't know that there's a definitive step by step how to for all of them.
I'm a big iron guy and figured out how to get it running on a Ubunutu VM on my Win10 machine, so probably anyone can do it.
Take a look through a few of these and decide what platform you want to install on and go from there.
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