4f574afe5a
Change Docker base images from Ubuntu to Debian, and use `snapshot.debian.org` as apt source list. Ubuntu occasionally removes version-pinned packages from apt (see #7484), which - breaks historical reproducible builds - introduces maintenance burden as we have to update the version pins Hopefully this change fixes both issues. merges https://github.com/spesmilo/electrum/pull/7926 closes https://github.com/spesmilo/electrum/issues/7484