Affirmative, Codeberg is the “official” public Forgejo instance and the organization which contributes the most to Forgejo development.

Unironically this. Also Juniper Junos.

How about both?

Regardless of configuration, you still need to access the instance from mastodon.mydomain.tld or lemmy.mydomain.tld, but you can configure the Mastodon to use @mastodonuser@mydomain.tld as its identifier by setting WEB_DOMAIN to mydomain.tld.

Mastodon documentation on the topic: https://docs.joinmastodon.org/admin/config/#web_domain

Literally me. Had to interview someone for a school project relating to religion a couple years back, so as a non-religious person I interviewed Richard Stallman. Ever since I’ve been using free software for pretty much everything. It has become such an obsession that I’ve gotten work due to it and I’ve forced even a government authority to change their ToS to not violate GPLv3.