Fix Website workflows

[Amar3tto]

Fixes #35838, Fixes #35837, Fixes #35835, Fixes #35834
Successful run: https://github.com/apache/beam/actions/runs/16871967621/job/47788316618

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[gemini-code-assist]

Summary of Changes

Hello @Amar3tto, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This PR aims to resolve several reported issues by updating the website's Docker build process. Specifically, it refactors the yarn package manager installation within the website/Dockerfile to improve reliability and security, ensuring that the website workflows can execute successfully.

Highlights

• website/Dockerfile updates: The yarn installation process has been revised to use a more secure and modern approach. This involves explicitly installing gnupg and ca-certificates, using gpg --dearmor to handle the GPG key, and specifying signed-by in the apt source list. This change addresses potential issues with the previous installation method and aligns with current best practices for adding external repositories.

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[github-actions]

Assigning reviewers:

R: @kennknowles for label website.

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[damccorm]

Thanks!