Make CI build required before merging PRs

[siddharth-krishna]

Closes # (if applicable).

Changes Proposed in This Pull Request

Trying to ensure that PRs can only be merged in if the website builds successfully. See https://stackoverflow.com/a/68613319/3189420

Checklist

• I tested my contribution locally, and it seems to work fine.
• Code and workflow changes are sufficiently documented.
• If new pages are added, maintainers are assigned for that document.
• If the document falls under a controlled category, a controlled document banner is present.

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