You should just update Channels internally, and if you want to update the container you can. I recently switched to @tmm1's image, which is rarely updated compared to when I updated mine every week.
For the second, no idea how IPTVBss works, sorry.
Are you deprecating your images or your GH repo?
I'm deprecating them and going to archive the GH repo for it soon. The docker images should exist and be fine for awhile I just won't update them.