Add some debug, strip out some quotes

Dockerfile

@@ -9,7 +9,7 @@ FROM builder AS netbootxyz-default
 ENV EXTRA_VARS=""
 
 FROM builder AS netbootxyz-production
-ENV EXTRA_VARS="--extra-vars '@script/netbootxyz-overrides.yml'"
+ENV EXTRA_VARS="--extra-vars @script/netbootxyz-overrides.yml"
 
 FROM netbootxyz-$NBXYZ_OVERRIDES as final
 RUN \

roles/netbootxyz/tasks/main.yml

@@ -1,4 +1,8 @@
 ---
+
+- debug: 
+    var: bootloader_disks
+
 - include_tasks: generate_menus.yml
   when:
     - generate_menus | default(true) | bool