[Feature Request] Relay Support

[Sythelux]

For Mastodon, Pleroma etc. there exists the way to hook into a relay to synchronize public messages for every instance within the relay:

Here is a website that lists them and shows a bit of an explanation: https://relaylist.com/

As an Administrator I would like my Pixelfed to be able to hook into such a relay as well, but I can't seem to find a Setting for it, so I think it isn't implemented, yet?

a more detailed explanation: https://joinfediverse.wiki/Relays

Here are some resources:

• if you look at the listed instances for example: https://relay.infosec.exchange/
  • it says to add https://relay.infosec.exchange/inbox or https://relay.infosec.exchange/actor
• there is a discussion on activitypub.rocks: https://socialhub.activitypub.rocks/t/fediverse-relays/4626
  • especially this post has some good information: https://socialhub.activitypub.rocks/t/fediverse-relays/4626/4
  • also important to mention the implementations themselves: Add federation relay support mastodon/mastodon#7998 , https://git.pleroma.social/pleroma/pleroma/-/merge_requests/264
• here is the relay implementation from asonix: https://git.asonix.dog/asonix/relay
  • we would need the other end for pixelfed though. (But Maybe we can ask Asonix or another relay dev?)

I'll research more about it and will try to keep the ticket updated with resources on that matter.