Use correct user on releases (#17806)
Use correct user on releases (#17806)

- Use the provided `doer` instead of `rel.Publisher`. The code will also
run on edited releases and deleted ones, which isn't necessary done by
`rel.Publisher`.

Co-authored-by: wxiaoguang <afddda5b6ea4f5ea4386c1c8946f240cce9ffa2e@gmail.com>
go-gitea/gitea,go-gitea/gitea,go-gitea/gitea