Add Podcast RSS feeds (#5487)

Add Podcast RSS feeds (#5487)

* Initial test implementation of Podcast RSS

This is a pretty simple implementation to add support for The Podcast Namespace in RSS -- instead of affecting the existing RSS implementation, this adds a new UI option.

I attempted to retain compatibility with the rest of the RSS feed implementation as much as possible and have created a temporary fork of the "pfeed" library to support this effort.

* Update to pfeed-podcast 1.2.2

* Initial test implementation of Podcast RSS

This is a pretty simple implementation to add support for The Podcast Namespace in RSS -- instead of affecting the existing RSS implementation, this adds a new UI option.

I attempted to retain compatibility with the rest of the RSS feed implementation as much as possible and have created a temporary fork of the "pfeed" library to support this effort.

* Update to pfeed-podcast 1.2.2

* Initial test implementation of Podcast RSS

This is a pretty simple implementation to add support for The Podcast Namespace in RSS -- instead of affecting the existing RSS implementation, this adds a new UI option.

I attempted to retain compatibility with the rest of the RSS feed implementation as much as possible and have created a temporary fork of the "pfeed" library to support this effort.

* Update to pfeed-podcast 1.2.2

* Add correct feed image to RSS channel

* Prefer HLS videos for podcast RSS

Remove video/stream titles, add optional height attribute to podcast RSS

* Prefix podcast RSS images with root server URL

* Add optional video query support to include captions

* Add transcripts & person images to podcast RSS feed

* Prefer webseed/webtorrent files over HLS fragmented mp4s

* Experimentally adding podcast fields to basic config page

* Add validation for new basic config fields

* Don't include "content" in podcast feed, use full description for "description"

* Initial test implementation of Podcast RSS

This is a pretty simple implementation to add support for The Podcast Namespace in RSS -- instead of affecting the existing RSS implementation, this adds a new UI option.

I attempted to retain compatibility with the rest of the RSS feed implementation as much as possible and have created a temporary fork of the "pfeed" library to support this effort.

* Update to pfeed-podcast 1.2.2

* Add correct feed image to RSS channel

* Prefer HLS videos for podcast RSS

Remove video/stream titles, add optional height attribute to podcast RSS

* Prefix podcast RSS images with root server URL

* Add optional video query support to include captions

* Add transcripts & person images to podcast RSS feed

* Prefer webseed/webtorrent files over HLS fragmented mp4s

* Experimentally adding podcast fields to basic config page

* Add validation for new basic config fields

* Don't include "content" in podcast feed, use full description for "description"

* Add medium/socialInteract to podcast RSS feeds. Use HTML for description

* Change base production image to bullseye, install prosody in image

* Add liveItem and trackers to Podcast RSS feeds

Remove height from alternateEnclosure, replaced with title.

* Clear Podcast RSS feed cache when live streams start/end

* Upgrade to Node 16

* Refactor clearCacheRoute to use ApiCache

* Remove unnecessary type hint

* Update dockerfile to node 16, install python-is-python2

* Use new file paths for captions/playlists

* Fix legacy videos in RSS after migration to object storage

* Improve method of identifying non-fragmented mp4s in podcast RSS feeds

* Don't include fragmented MP4s in podcast RSS feeds

* Add experimental support for podcast:categories on the podcast RSS item

* Fix undefined category when no videos exist

Allows for empty feeds to exist (important for feeds that might only go live)

* Add support for podcast:locked -- user has to opt in to show their email

* Use comma for podcast:categories delimiter

* Make cache clearing async

* Fix merge, temporarily test with pfeed-podcast

* Syntax changes

* Add EXT_MIMETYPE constants for captions

* Update & fix tests, fix enclosure mimetypes, remove admin email

* Add test for podacst:socialInteract

* Add filters hooks for podcast customTags

* Remove showdown, updated to pfeed-podcast 6.1.2

* Add 'action:api.live-video.state.updated' hook

* Avoid assigning undefined category to podcast feeds

* Remove nvmrc

* Remove comment

* Remove unused podcast config

* Remove more unused podcast config

* Fix MChannelAccountDefault type hint missed in merge

* Remove extra line

* Re-add newline in config

* Fix lint errors for isEmailPublic

* Fix thumbnails in podcast feeds

* Requested changes based on review

* Provide podcast rss 2.0 only on video channels

* Misc cleanup for a less messy PR

* Lint fixes

* Remove pfeed-podcast

* Add peertube version to new hooks

* Don't use query include, remove TODO

* Remove film medium hack

* Clear podcast rss cache before video/channel update hooks

* Clear podcast rss cache before video uploaded/deleted hooks

* Refactor podcast feed cache clearing

* Set correct person name from video channel

* Styling

* Fix tests

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Co-authored-by: Chocobozzz <me@florianbigard.com>