Document how to check if a release is immutable (as a user)

[dangbert]

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What article on docs.github.com is affected?

As a user of certain repos on github, I'd like to know how to verify if a given release in a repo of interest is immutable in order to understand my supply chain attack posture.

relevant docs to update: https://github.com/github/docs/blob/main/content/code-security/concepts/supply-chain-security/immutable-releases.md

What part(s) of the article would you like to see updated?

Add a new section called "Verifying Immutable Releases" explaining what to look for to know if a given release is immutable. E.g. how can I tell if this is an immutable release or not? https://github.com/google-github-actions/setup-gcloud/releases/tag/v3.0.1

Additional information

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[dangbert]

I found the answer on the page, I was overlooking it before. "If a release is immutable, you will see " Immutable" below the title on the release page." I would like to suggest bolding this text (#43716)

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