GitHub Apps currently cannot add PR reviews.
This would be useful because unlike Check Runs (which apply to a given commit no matter the branch/PR it is in), PR reviews are scoped to a specific PR.
An example use case would be blocking PRs that don't meet certain criteria (such a description in the PR body or title format).
Related issue: https://github.community/t5/GitHub-API-Development-and/Set-PR-status-without-being-tied-to-specific-...
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