FIX create gitea user bug

app/controllers/concerns/register_helper.rb

@@ -21,6 +21,7 @@ module RegisterHelper
       result = Gitea::User::GenerateTokenService.call(username, password)
       forge_user.gitea_token = result['sha1']
       forge_user.gitea_uid = gitea_user[:body]['id']
+      forge_user.mail = email
       if forge_user.save
         UserExtension.create!(user_id: forge_user.id) unless forge_user.user_extension.blank?
         result[:user] = {id: forge_user.id, token: forge_user.gitea_token}