Allow regular deploys of the website

This is now critical since there is some date comparison with the
"current" time. "Current" time means build time, so the website
must be built and deployed on a regular basis for this new logic
to be useful.

Author: fbiville

.github/workflows/deploy.yml

@@ -0,0 +1,44 @@
+name: Deploy
+
+on:
+  push:
+    branches: ['gh-pages']
+  workflow_dispatch:
+  schedule:
+    - cron: '0 */2 * * *'
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Setup Pages
+        uses: actions/configure-pages@v2
+      - name: Build with Jekyll
+        uses: actions/jekyll-build-pages@v1
+        with:
+          source: ./
+          destination: ./_site
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v1
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v1