Integrating Flathub releases with my release pipeline

I have a release pipeline with multiple jobs releasing to e.g. Github Releases, AUR, or NPM. Now I would like to integrate Flathub with the same pipeline. The manual process goes like this: * I push a tag, and build a new release * Then I manually update my Flathub repo with the new version and hash * I push to a branch, and open a PR * I wait ~10-15 minutes for the build to finish * I merge the PR manually I can automate all of it up to the point where I wait for the PR build. How do you guys handle it and are there any recommended ways of handling that? I can’t think of anything better than a job that runs every 5 minutes and polls the repo for open PRs to merge, but obviously that’s ugly. A major roadblock is that Github won’t let you receive webhooks from a repo you don’t have admin access to, so a true event-driven pipeline is off the table here.