Provide an Helm-Value to add extraContainers for each component

[hans-fischer]

Is your feature request related to a problem? Please describe. I realy want to have metrics about the mailu-installation. I know you guys dont provide the containers but there are ways to archive metrics over sidecar containers. Some of them just bind to the socket of the server e.g. postfix-unixsocket or dovecot-unixsocket.

Postfix: https://github.com/kumina/postfix_exporter Dovecot: https://github.com/kumina/dovecot_exporter

With the ability to add sidecar-containers to different pods I could mount the socket into the sidecar an provide metrics about mailu-components without touching/destroying the rest of your very good work.

Describe the solution you'd like It would be nice if I could just throw in the definition of a sidecar container and deploy it along with yout helm chart. Another possible usage for sidecars could be a backup container using a backup-solution like restic to backup all mailboxes to an s3 bucket.

Describe alternatives you've considered Use custom containers that provide metrics about the mailu-app without adding extra Containers but that would mean a lot of maintainance.

[hans-fischer]

Could someone review my pull-request? https://github.com/Mailu/helm-charts/pull/344

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[fastlorenzo]

closed in #344