refactor: pull container creation into standalone function
refactor: pull container creation into standalone function

this is necessary for us to be able to inject env vars into the call.

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