charts/redpanda: Add address config to allow listen on ::, instead of 0.0.0.0

[baryluk]

In some kubernetes deployments, the in-cluster traffic is only possible using
IPv6, with no in-cluster IPv4 available. Currently redpanda starts, but operator
cannot reach it, nor the brokers can reach each other.

Set to address: "::", to use IPv6

redpanda-data/helm-charts#169

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[baryluk]

Please note that this is still a draftish, as this is not the only way to do it.

• Option 1. Instead of use_ipv6, remove the use prefix.
• Option 2. Instead of 0.0.0.0 / ::, allow just specificity address explicitly.
• Option 3. Put it somewhere else

I did preliminary tests locally of the chart, but some things do fail, in unittests, but I do not know why would they fail.

So would be nice to run with official CI workflow to confirm.

[chrisseto]

My vote is for:

Option 2. Instead of 0.0.0.0 / ::, allow just specificity address explicitly.

Slap Address *string json:"address,omitempty" onto ListenerConfig and ExternalListener and default it to 0.0.0.0 if not specified.

[baryluk]

My vote is for:

Option 2. Instead of 0.0.0.0 / ::, allow just specificity address explicitly.

Slap Address *string json:"address,omitempty" onto ListenerConfig and ExternalListener and default it to 0.0.0.0 if not specified.

Done. used ListenAddress *string json:"listenAddress,omitempty", to be fully clear.

[chrisseto]

Done. used ListenAddress *string json:"listenAddress,omitempty", to be fully clear.

Sorry to nit pick but please stick with Address. ListenAddress is redundant with the parent struct's name (Listeners / ListenerConfig). It also clashes as Port is not ListenPort.

For additional clarity you can add a null value to values.yaml and document the purpose of the field.

[baryluk]

Done. used ListenAddress *string json:"listenAddress,omitempty", to be fully clear.

Sorry to nit pick but please stick with Address. ListenAddress is redundant with the parent struct's name (Listeners / ListenerConfig). It also clashes as Port is not ListenPort.

Fair enough. Done.

For additional clarity you can add a null value to values.yaml and document the purpose of the field.

Done.

Also included the .changes/unreleased/charts-redpanda-Added-20260901-142100.yaml