I may be missing something obvious here, but I'm encountering a very weird behaviour. If I launch mybinder on the main branch of my repo (https://github.com/StatisticsHealthEconomics/stat0019_binder/tree/main), all works fine. However, if I use a different branch (which, incidentally does have the exact same Dockerfile and apt.txt), mybinder fails to launch complaining that
E: The repository 'http://archive.ubuntu.com/ubuntu focal InRelease' is not signed.
(this happens for a few repos, actually).
I'm not sure why this is, because, like I said, the config files are identical. Also, the first time I launched mybinder after creating the new branch, it did work, but after that it stopped...
Anyone can help me make sense of this? Apologies if I'm missing something obvious, like I said...
Thanks! Gianluca