Clicking the button to create a pull request multiple times will create multiple identical pull requests

[ffbh123456]

Gitea Version

Gitea version 1.15.3 built with GNU Make 4.3, go1.16.8 : bindata, timetzdata, sqlite, sqlite_unlock_notify

Operating System

run in docker

Browser Version

google chrome 94.0.4606.61 (x86_64)

Can you reproduce the bug on the Gitea demo site?

Yes

Description

Quickly click the button to create a pull request, or you can use a script to quickly send some http requests to create pull request

Screenshots

I clicked a few more times and created several same pull requests at once

[noerw]

duplicate of #17111