Added one more workflow

Author: smistad

.github/workflows/deploy-down-for-maintenance.yaml

@@ -0,0 +1,40 @@
+name: Set Documentation Page as 'Down for Maintenance'
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Build docs
+        run: |
+          mkdir build
+          cd build
+          mkdir documentation
+          cd documentation
+          echo "<h1>This webpage is Down for Maintenance</h1>Please try again later." > index.html
+      - name: Setup Pages
+        id: pages
+        uses: actions/configure-pages@v5
+      - name: Upload static files as artifact
+        id: deployment
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: build/documentation/
+          retention-days: 1
+  deploy:
+    runs-on: ubuntu-24.04
+    needs: build
+    # Grant GITHUB_TOKEN the permissions required to make a Pages deployment
+    permissions:
+      pages: write      # to deploy to Pages
+      id-token: write   # to verify the deployment originates from an appropriate source
+
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4
+