[chart] support configuring dnsConfig

[stevo-f3]

Describe the feature you are requesting

Provide dnsConfig option for aws-load-balancer-controller Deployment Pods https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-dns-config

Motivation

with default ndots (5), requests to e.g. ec2.eu-west-2.amazonaws.com get unnecessarily expanded over search domains e.g. result in dns query for ec2.eu-west-2.amazonaws.com.eu-west-2.compute.internal.

Describe the proposed solution you'd like

Just like dnsPolicy was supported #2324 add equivalent for dnsConfig.

Describe alternatives you've considered

• (kyverno) policy to mutate aws-load-balancer-controller Pods
• forking chart and patching the fork

both of which are suboptimal

Contribution Intention (Optional)

• Yes, I am willing to contribute a PR to implement this feature
• No, I cannot work on a PR at this time

[wweiwei-li]

Hey, Since we have supported dnsPolicy, supporting configuring dnsConfig makes sense. I see you are willing to submit a PR. We welcome community contributions!