[Future] Integrate more secure secrets-management strategy into CI/CD pipeline

[MikeTheCanuck]

For the current season, the project_config.py + S3 pattern is a reasonable means of keeping project secrets out of GitHub repos.

For future seasons, let's look into additional solutions that reduce the attack surface on secrets even further, such as:

• Keywhiz https://square.github.io/keywhiz/
• Sneaker https://github.com/codahale/sneaker