chore: tweak options

Author: kenjis

.github/workflows/test-userguide.yml

@@ -25,4 +25,4 @@ jobs:
       - uses: ammaraskar/sphinx-action@0.4
         with:
           docs-folder: user_guide_src
-          build-command: make html SPHINXOPTS="-W"
+          build-command: 'make html SPHINXOPTS="-W --keep-going -w /tmp/sphinx-log"'