fix: Only deploy web pages if the test and release workflow finished …

…successfully

.github/workflows/jekyll-gh-pages.yml

@@ -25,6 +25,8 @@ jobs:
   # Build job
   build:
     runs-on: ubuntu-latest
+    # only run the job if the workflow executed OK
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4