npub123unf34rkq76qce0d4eedf4uekjmafqljazh7ykqjm59w79yk9gq3rykj8 (npub123u…ykj8) Collaboration without fork is an option, see https://forgejo.org/docs/latest/user/agit-support/
But it is not possible for external users (except if you share an SSH key with the public …)
We'll consider if we can find a sensible balance with regards to spam and moderation that allows external contributions.