only flush redis when running on heroku; don't delete files on start (see @46f36e9fede3984e85cb1cafa7a4fea67a56176d)
only flush redis when running on heroku; don't delete files on start (see @46f36e9fede3984e85cb1cafa7a4fea67a56176d)

crafatar/crafatar,crafatar/crafatar,crafatar/crafatar