Test Dockerfile for Cloud Foundry / Cloud Native Buildpack

This was used for developing the buildpack shim without having to constantly re-upload the buildpack shim and restage an app.

$ docker build -t v2-cnb-ruby-buildpack . && docker run v2-cnb-ruby-buildpack

This will run the buildpack shim on dora.

$ docker build -t v2-cnb-ruby-buildpack . && docker run --env 'BP_SLEEP=1' v2-cnb-ruby-buildpack

in another terminal, find the container id

$ docker ps

and open up a shell in it

$ docker exec -it d73ae2ac22ed /bin/bash