[Feature Request] Add opentrace to Flathub

[leohearts]

Is your feature request related to a problem? Please describe. 您所请求的功能是否和某个问题有关？如果有，请说明

No Describe the solution you'd like 描述您想要的功能 build a flatpak version and use flathub bot to automate builds.

Describe alternatives you've considered (If applicable) 可能备选方案（如果有） I'm currently working on it. Once finished, if you agree, we can make this official and add a flathub link to README :)

Additional context 补充说明