fix: set correct variable for app image repo
fix: set correct variable for app image repo

progrium/dokku,dokku/dokku,dokku/dokku,progrium/dokku,progrium/dokku,progrium/dokku,dokku/dokku,dokku/dokku,claytonbrown/dokku,dokku/dokku,progrium/dokku,claytonbrown/dokku,claytonbrown/dokku,claytonbrown/dokku,progrium/dokku,claytonbrown/dokku,claytonbrown/dokku,dokku/dokku,progrium/dokku,dokku/dokku,claytonbrown/dokku,progrium/dokku,dokku/dokku,claytonbrown/dokku