Prior to this commit, the docker compose build method would not properly
set build_args if given in a Vagrantfile. This commit fixes that by
using the passed in key `extra_args` from the docker build action.
Prior to this commit, the docker compose driver would _always_ path
expand a host volume no matter what. This is not always the correct
option, for example if that host volume is actually a reference to a key
inside a `volumes` hash instead of a path on disk. This commit changes
that by looking to see if the requested host volume is actually a
defined key inside the compose config, and if not, it will path expand
it like before. Otherwise it will leave the key "as is".
Brian Cain
Chris Roberts
Harry Weppner