tools: skip macOS GitHub Actions test on doc-only changes

We skip macOS GitHub Actions pushes on doc-only changes but the
intention was no doubt to skip them on pull requests too. We still run
the tests on Linux, so addons tests will still run when addons docs
change.

PR-URL: #38296
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Antoine du Hamel <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Darshan Sen <[email protected]>

Author: Trott

Diff for: .github/workflows/test-macos.yml

@@ -2,6 +2,8 @@ name: test-macOS
 
 on:
   pull_request:
+    paths-ignore:
+      - 'doc/**'
   push:
     branches:
       - master