Secrets engine is not rendered within Sidecars

[dhurng]

Sidecar configuration does not support:

1. Environment variables interpolated from Configmap (valuesFrom)
2. Key:Value secret rendering where Value if set to encrypted secret from Spinnaker, does not render properly.
   ex. {{/GIT_SYNC_PASSWORD: encrypted:k8s!n:spinnaker-github-token!k:token/}}

Please let me know if you need further information. Thank you