Github App implementation

[neubig]

A personal access token is not sufficient to send PRs from a fork: https://github.com/neubig/pr-viewer/actions/runs/11209219632

We may need to rethink how things are done in github actions. One possibility is to create a github app: https://docs.github.com/en/apps/creating-github-apps/about-creating-github-apps/about-creating-github-apps

[xingyaoww]

Once this issue is resolved, we might be able to do #202

[malhotra5]

This seems like a higher effort yet important task? I could take a shot at this. I'm thinking probot could be helpful to use. I'm also not too familiar with apps, will I have to transfer ownership to Openhands once its built?

[neubig]

Hey @malhotra5 , I can take this one (I've already started a little bit). If you're looking for other ones to do, I think that we're getting a few "job failed without logs" ones like this: #233

I think they could be pretty valuable to debug if that'd be possible.