Permissions and Framework for middleware to access postgresql db

[marycrawford]

As an engineer, we need the middleware service to access the postgresql db.

Accepted criteria:
[x] Securely provide credentials to middleware
[x] Ensure middleware can only access postgresql db
[x] Left first approach (with security in mind) in designing how to provide middleware with permissions to the db

[marycrawford]

Currently troubleshooting permission issues for vault.

[marycrawford]

Update PR to review since the secret is successfully being stored in Azure vault and the sslmode is in the middleware (application.yaml) and dev.yaml file.