I don't think you could automate the RSS as soon as you upload to a separate hosting service, because Publii works locally and requires you to manually publish your updated site to update your RSS. That said, you might be able to create a post for each episode, and include all the necessary podcast episode metadata (link to audio URL, link to cover, etc.). Then, when you update your website and publish it, it would update the RSS.
Haven't tested this though, so not sure how this would work in practice. My hunch is that you'll likely need to read up on what's needed for a podcast RSS, consult and edit the RSS handlebars file (see related forum post on overriding the default RSS feed layout), and create Post options with the Post Config options for any missing RSS specs.
I read something about an enclosure element as being a place where you could potentially include an audio file URL.
Here are some examples of RSS feed guidelines needed for different distributors (note that Publii may not include all of these in the default RSS):
- How To Create An RSS Feed For Your Podcast In 3 Steps > An Example Of A Podcast RSS Feed
- Apple Podcast RSS feed requirements
- RSS feed guidelines for Google Podcasts
- Spotify Podcast Delivery Specs
Sidenote: Any reason why you're leaning towards setting up your podcast on Publii vs using a free service like Anchor.fm (now Spotify for Podcasters), Acast, Redcircle etc.? All of your listening stats would be aggregated in one place, but there are, of course, tradeoffs. Here are some discussions on this that I've come across:
Audio Players
Shikwasa
In terms of audio players: Shikwasa is a pretty solid looking audio player for podcasts:
Downside: It won’t be able to create a live, up-to-date playlist of all your episodes (at least not yet).
Castbox
For an embedded playlist with all episodes: the only other way I could think of would be to embed iframes for websites that fetch external feeds or host podcasts. Based on this list, it looks like Castbox might be a good option for an embeddable player that updates based on the feed.
(reply to Recommendations for podcast)