Backport fixes for bookworm
- Get CI passing:
- d/salsa-ci.yml: Set RELEASE to bookworm
- Fix/ignore ShellCheck findings
- test: Fix too small ext2 block count
 
- Include missing drivers:
- Add hyper-keyboard module, needed to enter LUKS password in Hyper-V
- install hid-multitouch module for Surface Pro 4 Keyboard
- hook-functions: auto_add_modules: Add onboard_usb_hub, onboard_usb_dev
 
- Fix bug #1076539 for users installing
upstream firmware and in preparation for a backport of firmware-nonfree:
- hook_functions: Fix copy_file with source including a directory symlink
- hook-functions: copy_file: Canonicalise target filename