Allow to skip ConfigMap creation

[k0da]

There are cases where zones are different but plugins are. In order to avoid duplication of whole zone block configuration, allow to disable config map creation and let it to be managable externally, where it is possible to keep plugins configuration same, but change zone definition only.

Signed-off-by: Dinar Valeev [email protected]

[ErikLundJensen]

This change is important as it enables using CoreDNS as an external nameserver for Ingress/Gateway resources. For example the k8gb, which is a Geo redundant load balancer, manage the definition of the Corefile.

[hagaibarel]

Please rebase and bump the chart version

[cep21]

Bump:

I woud love to manage the configmap file in a syntax that more closely matches coredns itself, rather than YAML. This is difficult to do in the current helm chart.

[cep21]

Hi,

If the PR is safe, can we merge it in https://github.com/coredns/helm/pull/167? I did the requested "rebase and bump", but it only lasts as long as the next version.

I cannot edit other people's PRs, so I had to make a new one.

[hagaibarel]

Closing in favor of #167