Helm - connection string credentials in secret

[tskinner-oppfi]

Is your feature request related to a problem? Please describe. Using the current helm chart causes the connectionString to be stored in the helm values and a Kubernetes ConfigMap. It is generally considered a bad practice to store credentials in github (as IAC) or in Kubernetes ConfigMaps.

Describe the solution you'd like Allow the use of providing the connection string credentials or the connection string itself from an existing secret in Kubernetes.

Describe alternatives you've considered Not using the helm chart.