Fail early if warning in doc build

.github/workflows/github_action_build_docs.yml

@@ -34,12 +34,11 @@ jobs:
           cd docs/
           make install
 
-      # fail early here
+      # fail early here, run quickstrict with aborts also on warnings
       - name: Quick-test docs (no autodocs)
-        continue-on-error: true
         run: |
           cd docs/
-          make quick
+          make quickstrict
 
       # full game dir needed for mv-local
       - name: Set up evennia game dir

docs/Makefile

@@ -112,6 +112,10 @@ quick:
 	@echo "Documentation built (single version, no autodocs)."
 	@echo "To see result, open evennia/docs/build/html/index.html in a browser."
 
+# abort on warnings too
+quickstrict:
+	SPHINXOPTS=-W make quick
+
 local:
 	make _check-env
 	make clean