flathub, Developers: we’ve updated our documentation covering how to automatically submit app updates to Flathub: https://docs.flathub.org/docs/for-app-authors/updates#automatically-publish-updates
By using our External Data Checker, you can automatically propose (and optionally merge) updates to your app’s manifest when you make a new release or tag on your source repository; no manual fiddling with JSON or Yaml required.
After it’s merged, your update will automatically be built and submitted to Flathub.