rewrite postgres connection to use config object instead of connection url to make work with ssl config

[zenlex]

see this issue

Currently we're using connection string, but there's apparently an issue with DO's managed postgres/ssl and the k8s config at the moment or at least I haven't figured it out.

• Update k8s db secret to include the whole db config
• Update database/index.ts to use the config object instead of the URL

[zenlex]

Don't need to do at this time - got it working with the CA cert and the connection uri