fix: use correct method for executing dokku within tests
fix: use correct method for executing dokku within tests

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