The releng syslinux.cfg references UI .c32 modules that may not load,
causing syslinux to fall back without archisolabel= in the kernel cmdline
so the archiso initrd hook scans for an empty device label and sets root=''.
- Write our own minimal syslinux.cfg using %INSTALL_DIR%/%ARCHISO_LABEL%
placeholders; Dockerfile now only copies .c32 binaries from releng
- Add squashfs and overlay to mkinitcpio MODULES explicitly
- Remove microcode hook (no intel-ucode/amd-ucode packages installed)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
