Add forge now - process https://gitweb.gentoo.org/

https://archive.softwareheritage.org/admin/add-forge/request/13/

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Migrated from T4587 (view on Phabricator)

added System administrators priority:Normal + 1 deleted label

task will be handled in gitlab: https://gitlab.softwareheritage.org/infra/sysadm-environment/-/issues/4648