Lol no seriously, what's your goal here? Self-hosting a server seems entirely unnecessary.
If you want to host an RSS server, FreshRSS is easy to set up if you know how to do Docker stuff. Then, you could connect it to a podcast app on your phone. But all that seems very complicated when you could just install AntennaPod (which is open source), subscribe to a podcast's official RSS feed, and turn on notifications for that podcast. Adding an RSS server between your listening device and the original RSS server is unnecessary IMO, unless you have a use case that I'm not understanding.
Here is a use case: multiple device sync.
With a server client infrastructure, read status are synced to the server, so if I change device, I can pick it up where I left off. Same thing as using a cloud service, but self hosted.
Antennapod does offer that by hooking into the gpodder.net API.ive had varying success with gpodder.net but hosting that yourself (I host it as an app on my Nextcloud) is a breeze
I didn't know about antenna pod, and I assumed you were just being mean.
Why rss self hosting and seemingly complicated? I thought push notifications needed a back end of some kind. I didn't think that was possible with just a podcast app