adds further debug step

Author: eatyourpeas

.github/workflows/main_rcpch-nhs-organisations.yml

@@ -58,7 +58,8 @@ jobs:
         env:
           SITE_DIR: documentation/site
           DOCS_URL: https://rcpch.github.io/rcpch-nhs-organisations/
-        run: mkdocs build --config-file documentation/mkdocs.yml
+        run: |
+          mkdocs build --config-file documentation/mkdocs.yml --verbose || exit 1
 
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v3