Fixes deploy to Cloud.gov

[jadudm]

We prefer smaller PRs that merge more often.

Haiku-length summary

terraform changes
for sandboxes, still so small
jemison fits in

Additional details

We want a better TF for deploying to multiple environments. However, this allows a developer to push Jemison to Cloud.gov if the credentials are configured correctly.

A deploy comes in at 990MB, which might make it in a 1GB sandbox. We have 2GB at the moment, so there's a bit of space, but really... the purpose of this is just so we can have a live demo. The PR brings the changes in that make sure things build and deploy. No changes to application code, and most of this should/will go away with proper DevOps/TF work.

No issue was ticketed for this. Arguably supports #86, #85.

To test, you need to get credentials, set up a .tfvars file, be logged into cloud.gov/cf... perhaps better to pair. A link to the live demo might be sufficient (see Slack).

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[IsabelLaurenceau]

LGTM