docs: add BIND9 on Kubernetes with Kind tutorial for rfc2136 provider

[clwluvw]

What does it do ?

Add a step-by-step guide for deploying BIND9 and ExternalDNS inside a local Kind cluster, covering forward (A) and reverse (PTR) DNS zones with TSIG authentication.

Motivation

Implementing #6232

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

[k8s-ci-robot]

Hi @clwluvw. Thanks for your PR.

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[ivankatliarchuk]

/ok-to-test

[coveralls]

Pull Request Test Coverage Report for Build 23387297130

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 509 unchanged lines in 28 files lost coverage.
• Overall coverage decreased (-0.008%) to 78.14%

---

Files with Coverage Reduction	New Missed Lines	%
fake.go	1	96.23%
empty.go	1	75.0%
gen/docs/flags/main.go	2	74.47%
connector.go	2	83.33%
unstructured.go	4	83.19%
pod.go	5	97.28%
informers/indexers.go	7	88.52%
f5_virtualserver.go	8	79.79%
contour_httpproxy.go	8	84.33%
openshift_route.go	8	84.38%

Totals
Change from base Build 23251413358:	-0.008%
Covered Lines:	16393
Relevant Lines:	20979

---

💛 - Coveralls

[ivankatliarchuk]

/approve

[mloiseleur]

LGTM.
See my suggestions for tiny improvements.

[mloiseleur]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ivankatliarchuk, mloiseleur

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