Allow mounting of Kubernetes Secrets via Helm Chart

[hemantkathuria]

Is your feature request related to a problem? Please describe.
Current Helm Chart does not allow a way to load Kubernetes Secrets as Environment Variables. It is a very common use case to load secrets as Environment variables

Describe the solution you'd like
Allow loading Secrets from envFrom etc.

Describe alternatives you've considered
As suggested used the Helm Template command, modified the POD specification and applied the same. But this is not neat and not maintainable.

[kate-goldenring]

@hemantkathuria this is an important addition. As you mentioned, a Configuration with secrets added via envFrom could be generated as follows:

helm template akri akri-helm-charts/akri \
    --set rbac.enabled=false \
    --set controller.enabled=false \
    --set agent.enabled=false \
    --set opcua.configuration.enabled=true \
    --set opcua.configuration.brokerPod.image.repository=nginx \
    --set opcua.configuration.mountCertificates=true > configuration.yaml
# Modify configuration.yaml to include envFrom and correct volumes.

However, it would be better if Akri's helm chart supported setting envFrom just as it does support standard environment variables in a PodSpec. I.e.:

udev:
  configuration:
    brokerPod:
      env:
        FORMAT: JPEG
        RESOLUTION_WIDTH: 1000

Support can be added by adding a {{- if .Values.protocol.configuration.brokerPod.envFrom }} conditional to each Configuration Helm template as done for environment variables