ci: skip docs CI for flue-only PRs, add Flue CI workflow

[mvvmm]

Summary

Adds a paths-ignore: [".flue/**"] filter to ci.yml and a new flue-ci.yml workflow so that PRs touching only .flue/ skip the full docs build (Astro, link validation, deploy preview) and run a lightweight Flue-specific check instead.

ci.yml — adds paths-ignore: [".flue/**"] to the trigger. The workflow is not started at all when every changed file is under .flue/.

flue-ci.yml — new workflow triggered on paths: [".flue/**"] with three jobs that mirror the required status check names:

Job	What it does
Pre Build	pnpm run typecheck in .flue/
Build	pnpm run build in .flue/ — compiles the Worker via flue build
Post Build	No-op placeholder for future unit tests / evals

Since branch protection matches required checks by job name, a flue-only PR gets "Pre Build", "Build", and "Post Build" checks from flue-ci.yml instead of ci.yml, so merging is not blocked.

[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 outstanding issues in commit a2ff0ad.

Code Review

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Acknowledged by author (1)

Review	File	Issue	Note
Code	.github/workflows/flue-ci.yml line 69	Dead placeholder job	The author says the post-build job is an intentional required-check stub needed so the Post Build status check is reported for flue-only pull requests.

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[mvvmm]

CR-5e78317fda17 — this is addressed by the new flue-ci.yml workflow in this same PR. It has jobs named Pre Build, Build, and Post Build that run when .flue/** files change, satisfying any required status checks by name. The bot reviewed the two files independently rather than as a pair.

CR-bcde13235f0f — the post-build job is an intentional required-check stub, not a dead placeholder. Without it, the Post Build required status check is never reported for flue-only PRs, blocking merges. It will be replaced with real checks (unit tests, evals) when those are added.

[github-actions]

Nimbus Preview URL: https://nimbus-a2ff0adb.preview.developers.cloudflare.com
Nimbus Preview Branch URL: https://nimbus-flue-ci-path-filter.preview.developers.cloudflare.com

[github-actions]

Preview URL: https://a2ff0adb.preview.developers.cloudflare.com
Preview Branch URL: https://flue-ci-path-filter.preview.developers.cloudflare.com