fix: genapkovl copy to /var/tmp, udhcpc background mode

iso/builder/build-debug.sh

@@ -103,7 +103,9 @@ rm -rf /var/tmp/bee-iso-work
 
 # Run from /var/tmp to avoid git repo context conflicts and to ensure enough scratch space.
 # mkinitfs/update-kernel use TMPDIR for initramfs build; tmpfs /tmp is only ~1GB.
+# mkimage.sh sources genapkovl-*.sh from CWD (not from ~/.mkimage), so copy it here too.
 export TMPDIR=/var/tmp
+cp "${BUILDER_DIR}/genapkovl-bee_debug.sh" /var/tmp/
 cd /var/tmp
 sh /usr/share/aports/scripts/mkimage.sh \
     --tag "v${ALPINE_VERSION}" \