fix(iso): pin wget to v4 AFTER its package installs — conffile prompt is fatal otherwise

Build #189 proved the IPv4 fix works (downloads all succeeded) and proved
my own edit wrong: appending inet4_only to /etc/wgetrc before wget's
package landed made dpkg's conffile prompt hit EOF, leaving wget and
debootstrap unconfigured. Moved the pin below the apt install.

Co-Authored-By: Claude <noreply@anthropic.com>

image-recipe/_archived/build-auto-installer-iso.sh

@@ -838,13 +838,17 @@ set -e
 # answers AAAA first, wget tries v6 with long timeouts, and debootstrap's
 # per-package fetch fails ("Couldn't download packages", repro'd twice on
 # 2026-08-07). Force v4 for every retrieval tool this script drives.
-echo 'inet4_only = on' >> /etc/wgetrc
 APT_V4='-o Acquire::ForceIPv4=true'
 
 apt-get $APT_V4 update -qq
 apt-get $APT_V4 install -y -qq debootstrap squashfs-tools initramfs-tools dosfstools mtools \
     grub-efi-amd64-bin grub-pc-bin grub-common isolinux syslinux-common
 
+# wget gets its v4 pin AFTER its package is installed — editing /etc/wgetrc
+# beforehand makes dpkg's conffile prompt fatal on a non-interactive shell
+# ("end of file on stdin at conffile prompt", repro'd on build #189).
+echo 'inet4_only = on' >> /etc/wgetrc
+
 echo "   [container] Running debootstrap --variant=minbase..."
 # ifupdown + isc-dhcp-client added because live-boot's /init writes
 # /etc/network/interfaces on the target — without ifupdown, /etc/network/