Add bootloader configs, ISO profile, and integrate with build script/README

[Dzodah8772]

Motivation

• Provide a complete archiso profile including bootloader pieces so the generated ISO can boot on BIOS and UEFI systems.
• Centralize ISO metadata and boot mode configuration to make builds reproducible and configurable.
• Integrate bootloader/profile artifacts into the existing build and container workflows for easier local and CI/containerized builds.

Description

• Add a profiledef.sh file with ISO metadata (iso_name, iso_label, iso_version, bootmodes, etc.) to drive archiso profile settings.
• Add BIOS and UEFI bootloader configs under boot/ including boot/isolinux/isolinux.cfg and systemd-boot files in boot/efiboot/loader/ and boot/efiboot/loader/entries/archflux.conf.
• Update scripts/build.sh to copy profiledef.sh and the boot/ directory into the generated profile and preserve existing behavior for packages.x86_64 and airootfs/.
• Include supporting repository artifacts and documentation: add packages.x86_64 sample package list, airootfs/ overlays (/etc/hostname, /etc/motd, /root/.bashrc), a Dockerfile for containerized builds, and .gitignore entries; update README.md to document profiledef.sh and boot/ inputs and quick-start build instructions.

Testing

• No automated tests were run.

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep syslinux modules when overriding isolinux

This block deletes the template isolinux/ directory and replaces it with the repo copy, which only contains isolinux.cfg. In the releng profile, isolinux/ also includes required Syslinux binaries/modules (e.g., isolinux.bin, ldlinux.c32, menu.c32). Removing them makes BIOS boot fail at runtime. Consider copying just isolinux.cfg (or merging) instead of replacing the whole directory so the bootloader binaries stay present.

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[chatgpt-codex-connector]

Preserve UEFI bootloader binaries in efiboot

Here the script deletes the releng efiboot/ directory and replaces it with the repo copy, which only provides loader config/entries. The releng profile also ships the EFI bootloader binaries (e.g., EFI/BOOT/BOOTx64.EFI from systemd-boot). Removing those files results in a UEFI-bootable ISO that lacks the actual bootloader. Copy or overlay just the config files so the EFI binaries remain.

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