CoreDNS provider - ETCD authentication

[eaglesemanation]

What would you like to be added:
A way to provide username and password for etcd authentication. Probably in a form of 2 environment vairables: ETCD_USER and ETCD_PASS

Why is this needed:
Currently I'm trying to deploy external-dns in combination with coredns and etcd on my bare-metal cluster. I've followed coredns doc with exception of using bitnami helm chart instead of archived etcd-operator. After doing all of that external-dns pod reported this error:

time="2022-02-21T23:09:13Z" level=error msg="etcdserver: user name is empty"

I've tried to add credentials directly into endpoints env variable in a form of http://user:pass@endpoint:port but it didn't change anything. After that I decided to look through provider/coredns/coredns.go code, and even though I don't have that much experience with Go, I'm pretty sure there is no code for authentication.

I'll try to work on that, just wanted to document my findings somewhere publicly

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/lifecycle stale

[eaglesemanation]

/remove-lifecycle stale

[k8s-triage-robot]

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/lifecycle stale

[k8s-triage-robot]

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/lifecycle rotten

[k8s-triage-robot]

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

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/close not-planned

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[eaglesemanation]

/reopen

[k8s-ci-robot]

@eaglesemanation: Reopened this issue.

In response to this:

/reopen

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[eaglesemanation]

/remove-lifecycle rotten

[k8s-triage-robot]

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• After 90d of inactivity, lifecycle/stale is applied
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/lifecycle stale

[k8s-triage-robot]

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/lifecycle rotten

[eaglesemanation]

/remove-lifecycle rotten

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues.

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/lifecycle rotten

[vaibhav2107]

/remove-lifecycle rotten

[k8s-triage-robot]

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/lifecycle stale

[6ixfalls]

/remove-lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/lifecycle stale

[6ixfalls]

/remove-lifecycle stale