Yeah, unfortunately Chromecast is not a standard in that sense. It’s a locked down Google thing that you aren’t allowed to Self Host. I’m not aware of any compatible implementations, and even if there was one I’d have to assume it involved “stolen” keys or something similarly “forbidden”.
Some tips:
apt build-dep
,apt source
, anddebuild
to try and recreate the native apt build process. These tools will give you the source that built the system package, and its dependencies, and allow you to build a deb yourself out of it. Test the build to make sure it’s working as-is. If it is, and if the software’s dependencies haven’t changed too much, you can even use apt to fetch the old version that’s in the repos, update the code to reflect the upstream release, and then test the build there to see if it still builds. If so, now you have something you can start working off.Good luck out there, and try not to be discouraged!