Cannot read environment variable from ConfigMap or Secret

[hertfelder]

The env section in the hivemqCluster CRD only allows for key and value: https://github.com/hivemq/helm-charts/blob/e54315b3daf61f6cdc57f3250976af1619a60cd2/charts/hivemq-operator/hivemqCluster.json#L104-L123

When I want to set the Control Center user and password from a secret, this is obviously not possible. It is only possible to set it directly in the CRD, which lacks flexibility and security (user/password (hashed) in Git).