fix: clean workdir before build so apkovl changes are always applied

iso/builder/build-debug.sh

@@ -98,6 +98,9 @@ cp "${BUILDER_DIR}/genapkovl-bee_debug.sh" "${HOME}/.mkimage/"
 # Export overlay dir so the profile script can find it regardless of SRCDIR.
 export BEE_OVERLAY_DIR="${OVERLAY_DIR}"
 
+# Clean workdir so apkovl changes are always picked up (kernel/apks sections are re-cached).
+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.
 export TMPDIR=/var/tmp