refactor(iso): Rely on select_part for ZFS partition identification (#1)

setup.sh

@@ -570,25 +570,7 @@ function main () {
         set_ntp
         update_pacman_db
         install_pkgs 'jq'
-        declare zfs_part
-        zfs_part="$(get_parts 'zfs')"
-        if we_have_exactly_one_part 'zfs' "${zfs_part}"; then
-            printf -- 'Creating zpool on partition '"'"'%s'"'"' ...\n' "${zfs_part}"
-            install_zfs
-            setup_zpool "${zfs_part}"
-            mount_system
-            copy_zpool_cache
-            install_archlinux
-            gen_fstab
-            set_hostname
-            set_locale
-            add_zfs_hook_to_initramfs
-            set_initramfs_build_list
-            add_zfs_files_to_new_os
-            enter_chroot
-            # We're done in chroot
-            finalize_os_setup
-        fi
+        zfs_part="$(select_part 'zfs')"
     fi
 }