feat: add arch imag

arch/files/pacstrap-docker

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+out() { printf "$1 $2\n" "${@:3}"; }
+error() { out "==> ERROR:" "$@"; } >&2
+die() { error "$@"; exit 1; }
+
+(( $# )) || die "No root directory specified"
+newroot=$1; shift
+pacman_args=("${@:-base}")
+
+if [[ $EUID -ne 0 ]]; then
+	die "This script must be run as root"
+fi
+
+[[ -d $newroot ]] || die "%s is not a directory" "$newroot"
+
+echo 'Creating install root at %s' "$newroot"
+mkdir -m 0755 -p "$newroot"/var/{cache/pacman/pkg,lib/pacman,log} "$newroot"/{dev,run,etc}
+mkdir -m 1777 -p "$newroot"/tmp
+mkdir -m 0555 -p "$newroot"/{sys,proc}
+
+echo 'Creating /dev/null in new root'
+mknod "$newroot/dev/null" c 1 3
+
+echo 'Installing packages to %s' "$newroot"
+if ! pacman -r "$newroot" -Sy --noconfirm "${pacman_args[@]}"; then
+	die 'Failed to install packages to new root'
+fi
+
+echo 'Deleting /dev/null from new root'
+rm "$newroot/dev/null"