release: build docs as container image

[dvdksn]

Description

Adds instructions for building the docs as a container image.

Related issues or tickets

• Why the docs/docker.github.io image stop update ? #20328

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[docker-robot]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions.
As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

If the updates are still relevant, review our contribution guidelines and rebase your pull request against the latest version of the docs, then mark it as fresh with a /remove-lifecycle stale comment.
If not, this pull request will be closed in 30 days. This helps our maintainers focus on the active pull requests.

Prevent pull requests from auto-closing with a /lifecycle frozen comment.

/lifecycle stale

[dvdksn]

@usha-mandya if we want to have this workflow, you or @thaJeztah need to add the credentials to the github repo (i don't have permissions)

docs/.github/workflows/build.yml

Lines 122 to 127 in 976c9d9

	-
	name: Login to Docker Hub
	uses: docker/login-action@3
	with:
	username: ${{ secrets.DOCKER_USER }}
	password: ${{ secrets.DOCKER_TOKEN }}