- Created sources.list in includes.chroot_before_packages for build-time access
- Added Debian backports repository for additional packages
- Created apt preferences file for proper package priority management
- Devuan packages prioritized over Debian (pin-priority 900 vs 100)
- Firmware packages from Debian get higher priority if not in Devuan
- Security updates properly prioritized
- Ensures chroot has access to all repositories during build process
- Maintains compatibility between Devuan and Debian package ecosystems