Use literal 'Squid' in msg_* labels, add missing msg_ok and spacing in
update_script. Replace install_packages_with_retry/enable_and_start_service/
safe_service_restart helpers with plain apt and systemctl commands. Merge
auth setup and config validation into a single msg block. Drop the custom
/etc/profile.d MOTD heredoc and trailing htpasswd echo.
Add Arch Linux container support and integrate pacman into install utilities. New files: ct/archlinux.sh (container build/update script), install/archlinux-install.sh (install entrypoint), and json/archlinux.json (metadata). misc/install.func: detect_arch in detect_os, add pacman bootstrap, and implement pacman handlers for pkg_upgrade, pkg_install, pkg_remove, pkg_clean and package refresh; include openssh install path for pacman and provide a cleanup_lxc override to run pkg_clean. Enables creating/updating Arch Linux LXC containers and proper package manager handling.
Bump Fedora template to 43 and enhance container installation tooling. Persist DIAGNOSTICS setting and introduce post_progress_to_api() to send lightweight telemetry pings from inside containers (fire-and-forget, enabled when DIAGNOSTICS=yes and RANDOM_UUID set). Harden package management flows: re-detect PKG_MANAGER when commands are missing, add apt mirror fallback logic (apt_update_safe) and more robust apt-cacher proxy parsing. Fix Debian 13 LXC root ownership bug (chown /) and add additional DNS/Git host checks (including api.github.com). Improve downloading and validation of tools.func, add multiple post_progress_to_api hooks to signal progress, and add two new install entrypoints (misc/main/install.func and misc/main/alpine-install.func) that consolidate network checks, OS updates, MOTD/SSH setup and container customization.
