ci: Skip build_docs more often (#33398)

Don't run `build_docs` when the only change is:
`.github/{workflows,ISSUE_TEMPLATE}/**`.
Example [extra
run](https://github.com/zed-industries/zed/actions/runs/15883155767).

Release Notes:

- N/A
294147f473Peter Tripp committed on 6/25/2025, 6:24:47 PM· committed by GitHubparent4516b09
1 file changedLine totals unavailable