Add conditional noindex meta tag for preliminary and archive

[milinddethe15]

Description

#15458

Added noindex meta tag, for preliminary and upcoming archive, by conditional logic in < head > tag of /layouts/_default/baseof.html

For preliminary.istio.io :: set .Site.Data.args.preliminary = true
For archive.istio.io / in future, when creating snapshot of current version :: set .Site.Data.args.archive = true

Value of args are set here:

istio.io/data/args.yml

Lines 19 to 20 in 1a03657

	preliminary: true
	archive: false

Reviewers

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• Test and Release
• User Experience
• Developer Infrastructure
• Localization/Translation

[istio-testing]

Hi @milinddethe15. Thanks for your PR.

I'm waiting for a istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[Arhell]

/ok-to-test

[milinddethe15]

@craigbox PTAL