[Helm Chart] Add env, configmap, secret and volumes support #137
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We have the use case of using
google-cas-issuer
outside of GKE but want to lean on GCP's Workload Identity instead of static Service Account credentials.We can achieve this by using a ConfigMap/Secret mounting the Workload Identity Pool credential configuration JSON and referencing it via the
GOOGLE_APPLICATION_CREDENTIALS
environment variable.This PR enables this with the generic solution of supporting arbitrary
env
, ConfigMap, Secret andvolumes
/volumeMounts
support.