Support GCP CloudSQL Proxy for connecting to Postgres database in GCP deployment

[TristanSpeakEasy]

Proposed change

Enable connection to CloudSQL through the sidecar CloudSQL Proxy https://cloud.google.com/sql/docs/mysql/connect-kubernetes-engine#run_the_in_a_sidecar_pattern

Alternative options

Provide chart values for external database and needing to manage authorized networks for secure connection between postgres and posthog

Additional context

This would simplify deployments in GCP with managed databases

[voarsh2]

Haha. I'm sorry, but they're sunsetting this Helm Chart. Perhaps someone should fork it and have it community maintained?