(feature request) (helm) update helm chart to use 'binamilegacy/rabbitmq'

[lknite]

bitnami/rabbitmq doesn't work anymore.

The future is unclear, but for now updating the helm chart to reference bitnamilegacy/rabbitmq will result in a working helm chart (which is currently broken)

[TistaRoy]

@zulipbot claim

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[Sahilxrajput]

@zulipbot claim

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