fix: install profile to ~/.mkimage, pass overlay via BEE_OVERLAY_DIR env

iso/builder/build-debug.sh

@@ -89,7 +89,15 @@ mkdir -p "${DIST_DIR}"
 echo ""
 echo "=== building ISO ==="
 
-# mkimage.sh uses git internally; run it from /tmp to avoid conflicts with bee repo
+# Install our mkimage profile where mkimage.sh can find it.
+# ~/.mkimage is the user plugin directory loaded by mkimage.sh.
+mkdir -p "${HOME}/.mkimage"
+cp "${BUILDER_DIR}/mkimg.bee_debug.sh" "${HOME}/.mkimage/"
+
+# Export overlay dir so the profile script can find it regardless of SRCDIR.
+export BEE_OVERLAY_DIR="${OVERLAY_DIR}"
+
+# mkimage.sh uses git internally; run from /tmp to avoid conflicts with bee repo.
 cd /tmp
 sh /usr/share/aports/scripts/mkimage.sh \
     --tag "v${ALPINE_VERSION}" \