ci: comment README screenshot differences on pull requests - #122
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This was referenced Sep 21, 2026
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This improves the failure feedback from the README screenshot check.
When the screenshot comparison fails, the artifact now contains the committed (expected) screenshot, the generated screenshot, and the visual diff when dimensions match.
A separate
workflow_runworkflow downloads only that artifact and posts the images directly on the pull request. This keeps the original PR workflow unprivileged, including Dependabot and fork PRs. The privileged follow-up workflow does not check out or execute pull request code.The comment shows:
This follows the failure observed in #119, where the artifact existed but reviewers had to open and download it manually.