How to use Kubernetes Secret to specify HiveMQ license with HiveMQ Operator.
HiveMQ requires a license as a file in /opt/hivemq/license
directory. There are 3 ways to add the license with HiveMQ Operator:
as a raw value in the values.yaml file,
as a configMap in the values.yaml file,
as a secret in the values.yaml file.
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