Ensure the env dir exists before adding evars
Ensure the env dir exists before adding evars

pagodabox/nanobox-docker-build,pagodabox/nanobox-docker-build,nanobox-io/nanobox-docker-build,nanobox-io/nanobox-docker-build,nanobox-io/nanobox-docker-build,nanobox-io/nanobox-docker-build