Get a "hello production" (empty site) deployed through CI and running in Cloud.gov Pages

[beechnut]

Acceptance criteria

• Ensure we can deploy 18f.gsa.gov to Cloud.gov pages production
• Ensure we can deploy 18f.gsa.gov to Cloud.gov non-production env for testing

[bpdesigns]

up on cloud.gov waiting for access to pages

[cantsin]

I've fixed access to pages and pages now successfully builds for 18f.gsa.gov. Not sure what Cloud.gov non-production env means here -- but if it is cloud.gov pages, that one is fixed. Marking as done.

[cantsin]

See #3871 for some associated work on this -- sorry, the CI failures were driving me up the wall

[jasnakai]

The 18f.gsa.gov repo is running on Pages. Double checked that the replatform-main branch builds: https://federalist-c58f58dc-a215-4616-a54c-12b5eb011096.sites.pages.cloud.gov/preview/18f/18f.gsa.gov/replatform-main/.
Closing this out as Done.