Setup gcloud credentials when running interactively within docker

[adrienthebo]

Pushing this out to a separate issue so that we can get #20 merged.

When using make docker_run, we should source the test config so that CLOUDSDK_AUTH_CREDENTIAL_FILE_OVERRIDE is set in the shell environment.

diff --git i/Makefile w/Makefile
index 6e16919..73ff8bf 100644
--- i/Makefile
+++ w/Makefile
@@ -119,7 +119,7 @@ docker_run:
        docker run --rm -it \
                -v $(CURDIR):/cftk/workdir \
                ${DOCKER_IMAGE_KITCHEN_TERRAFORM}:${DOCKER_TAG_KITCHEN_TERRAFORM} \
-               /bin/bash
+               /bin/bash --rcfile ${TEST_CONFIG_FILE_LOCATION}

 .PHONY: docker_create
 docker_create: docker_build_terraform docker_build_kitchen_terraform

Alternately, we can set the environment variables within the tests, as such:

ENV['CLOUDSDK_AUTH_CREDENTIAL_FILE_OVERRIDE'] = File.expand_path(
  File.join("../..", credentials_path),
  __FILE__)

Though this feels somewhat brittle.

[Jberlinsky]

This has been addressed for a while, closing.