Infix v24.04.2

Changes

• Add small delay in U-Boot to allow stopping boot on reference boards
• Document how to provision the bootloader and Infix on a blank board
• Use initial hostname from /etc/os-release as configuration fallback

Fixes

• Fix build regressions in cn9130_crb_boot_defconfig caused by upgrade
  to Buildroot v2024.02 and recent multi-key support in RAUC and U-Boot
• Fix provisioning script after changes to make GRUB loading more robust
• Fix missing /etc/resolv.conf, as noticed by avahi-daemon, when a
  user calls no system from the CLI
• Fix #428: loss of admin account after upgrade to v24.04
• Fix #429: failing to load startup-config does not trigger the fail
  secure mode, causing the system to end up in an undefined state