Can't create a new user for a specific forge

Clear and concise description of the problem

When I create a new user in the admin view, the first forge seems to get auto-assigned. I cannot pick another one.

Suggested solution

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Alternative

No response

Additional context

No response

Validations

• Checked that the feature isn't part of the next version already [https://woodpecker-ci.org/versions]
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.