refactor: handle case copied file is not directly readable
refactor: handle case copied file is not directly readable

If "docker cp" is run within docker, it seems the owner is root, resulting in other processes not being able to directly read the file without resorting to `cat` trickery. Doing this in a single place avoids the problem completely.

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