Debian unstable and testing don't have VERSION_ID in /etc/os-release. This change falls back to VERSION_CODENAME when VERSION_ID is missing, producing cache keys like 'debian-sid' for unstable. Fixes #773
Debian unstable and testing don't have VERSION_ID in /etc/os-release. This change falls back to VERSION_CODENAME when VERSION_ID is missing, producing cache keys like 'debian-sid' for unstable. Fixes #773