Add support for TLS-enabled Cassandra configurations #552
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What was changed
We add support for TLS-enabled Cassandra-based persistence stores.
Why?
Production best practices prescribe TLS-enabled connections wherever available, and Cassandra databases offer this feature. This patch allows consumers of the Temporal helm-chart to configure TLS-enabled Cassandra clusters as a persistence store using established idioms such as additionalVolume configuration. We also extend the mechanism for setting admintools environment variables like TLS support for SQL databases.