Elementary OS Code app is not in Flatpak repo

### Problem

The Flatpak Repo here: [Elementary OS flatpak repo](https://flatpak.elementaryos.org/) is missing this code app.
Is this by design? Is there some other way to get the flatpak version?

I'm not on Elementary OS anymore but would still love to use the code app.
(I've tried manually compiling it but ran into issues I don't have time to debug at the moment)

### Proposal

Add this app to the official repo so other distros can add it to their app stores

### Prior Art (Optional)

_No response_

未指定任何仓库文件、测试或入口点。首先检查链接的 Elementary OS Flatpak 仓库以及 Code 项目的 packaging 或 build 元数据；当应用被官方仓库接受，并可通过其他发行版的应用商店获取时，即视为完成。

由索引模型根据 Issue 内容生成。