update env.list to include BACKGROUND_IMAGE env var
update env.list to include BACKGROUND_IMAGE env var
learningequality/kolibri,mrpau/kolibri,mrpau/kolibri,indirectlylit/kolibri,indirectlylit/kolibri,learningequality/kolibri,learningequality/kolibri,mrpau/kolibri,learningequality/kolibri,mrpau/kolibri,indirectlylit/kolibri,indirectlylit/kolibri