lister-phabricator: List dev.gnupg.org instance

Reading through the apt-listchanges emails, i discovered the gnupg forge is a phabricator instance.

We should be able to list it [1].

The requisite to list such instance is:

• discuss with the gnupg sysadmins to introduce ourselves and our goal
• create a swhbot user and generate an api token.
• then reference it to the swh-site's credentials repository.
• Add a new scheduling entry swh scheduler task add... for it
• Announce ourselves prior to trigger the listing

Registering authentication is possible at [2]

• [1] https://dev.gnupg.org

• [2] https://dev.gnupg.org/auth/start/

---

Migrated from T2043 (view on Phabricator)