feat(helm): add support for initContainers on the chart

[brunomanzo]

Kubernetes 1.29+ now supports sidecars containers: https://kubernetes.io/docs/concepts/workloads/pods/sidecar-containers/

Add support initContainers as a field on the chart.

[burningalchemist]

Hey @brunomanzo, thanks for your contribution!

Do you have any particular ideas on how initContainers might be used in the sql_exporter helm chart? I believe users might find it useful.

Also, please make sure to check Dev Notes (https://github.com/burningalchemist/sql_exporter/tree/master/helm#dev-notes).

The version in Chart.yaml also needs a bump up. Not sure if it's a backward-compatible change, so it might be 0.12.

[brunomanzo]

@burningalchemist Ah, my bad, I will fix it

Currently I am using with cloud-sql-proxy as a sidecar, it could be used in the extraContainers but since kuberentes 1.29 we are using the initContainers for such container.

[burningalchemist]

@brunomanzo Cool, sounds good to me! 🙌

[burningalchemist]

@brunomanzo, apologies, the version should be semantically correct, so it's 0.12.0. 👍

[burningalchemist]

🚀