Lemmy (and Kbin for that matter) very much do the same thing for posts. I don’t think they fetch URL previews for links in comments, but that doesn’t matter: posts and comments are both fairly likely to end up spreading to Mastodon/etc anyway, so even comments will trigger this cascade.

Direct example: If you go to mastodon.social, stick @fediverse@lemmy.world in the search box at the topleft and click for the profile, you can end up browsing a large Mastodon server’s view of this community, and your very link has a preview. (Unfortunately, links to federated communities just result in a redirect, so you have to navigate through Mastodon’s UI.)

Login isn’t necessary, but there is no :latest tag published so you need to pull a version that exists. The current version is at codeberg.org/forgejo/forgejo:1.21.8-0 or at :1.21 if you want one that tracks patch updates (as found in the container registry).

As pointed out, the DNS issue was fixed, and the other point made about Python wheels has also been addressed; quite a good chunk of packages on PyPi have had a musl wheel added in the past 6 months or so, including numpy & scipy. I’m also not certain if the Go part is true; probably somewhere around half of the Go apps I’m running as a container are running or were built on an Alpine base.

A lot of smaller Masto/Pleroma/other “microblog” side of the verse admins signed FediPact. It’s mostly smaller instances, but there’s still a good amount of them and it’s enough that Meta will at least face some struggles in wide federation.