chore: respect .prettierignore in auto-format workflow

[mvvmm]

Summary

The auto-format workflow builds an explicit file list from git diff and passes it directly to prettier --write, which bypasses .prettierignore.

Adding --ignore-path .prettierignore makes prettier respect the ignore file even when files are passed explicitly.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/.github/	@cloudflare/content-engineering, @kodster28, @mvvmm, @colbywhite, @ahaywood, @MohamedH1998

[cloudflare-docs-bot]

Review

✅ No style-guide issues found in commit 947c8b8.

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[ask-bonk]

Correct and safe change. Explicitly passing ensures the auto-format workflow respects the ignore file even when files are listed explicitly from .

Posted a minor note on the description — in local testing with prettier 3.8.3 the default ignore resolution does work with explicit paths, but making it explicit is harmless and more robust.

[ask-bonk]

Review summary

• Labels: Added (already had ).
• Change: Adds to the auto-format workflow so prettier explicitly uses the ignore file when formatting a list of changed files.
• Issues: None. The change is correct, safe, and already approved by a CODEOWNER. Minor observation: in local testing, prettier 3.8.3 does resolve by default even with explicit file paths, so this change may be a no-op for behavior. However, making it explicit is harmless and guards against future prettier behavior changes or edge cases.

[ask-bonk]

I have reviewed PR #31344.

What I did:

• Read the diff in .github/workflows/auto-format-build.yml: adds --ignore-path .prettierignore to the prettier --write invocation so the ignore file is explicitly respected when files are passed from git diff.
• Applied labels: Added engineering (size/xs was already present).
• Posted an approval: The change is correct and safe. It makes the workflow explicitly use the .prettierignore file rather than relying on prettier's implicit resolution.
• Posted a summary comment on the PR noting that, while the change is harmless and good defensive practice, local testing with prettier 3.8.3 showed that .prettierignore is already respected by default even with explicit file paths, so this may be a no-op for behavior.

Issues flagged: None. The PR is a clean 1-line infrastructure fix, already approved by a CODEOWNER (MohamedH1998), and all status checks are passing.

github run

[github-actions]

Preview URL: https://947c8b8f.preview.developers.cloudflare.com
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